Searched the forum and still can’t find the answer to your question? Just reply to this topic, and someone will help you out! 
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Well — I played detective and took a closer look at the card and the postmarks.
From what it looks like, it was even postmarked twice: once at a post office (the lower one right next to the Priority label in the town of Weil der … (probably Weil der Stadt) and another time at a sorting center (that’s the faded wavy line postmark).
From what it looks like, there must’ve been a stamp on the card as the ink impressions of both postmarks suddenly end like this (marked with the green line):
…and this space perfectly matches with the size of our old flower definitive stamps.
As far as I’m concerned, it’s quite unlikely that a card without any stamps successfully passed both through manual inspection at a post office counter AND a sorting center and would’ve been caught by Deutsche Post at some point — so I guess this is no case of postal fraud.
I guess @Angelthecat is right: the glue on our stamps doesn’t stick properly onto washi tapes, so it must have fallen off somewhere on the card’s journey after it got postmarked.
I would probably just register the card in this case — but as @Bille suggested, you could also contact support.
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Today I had a card registered by the PostCrossing team of a card sent 354 days ago! I had sent out a second card to this user after about 100 days as they were still active. After that was never registered I just gave up on that one.
Not only was my card automatically registered it seems, but looking at the users profile over 400 more cards were registed by them today! How does something like this happen?
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I have moved your question here, as it does not make sense to open a topic about it.
There may be various reasons why cards are automatically registered by postcrossing.
You can read about it here 
Automatic Registering of Cards
We can only speculate as to why all these cards did not reach the recipient.
However, as it is clear who the user is, this would be inappropriate.
The best thing to do would be to ask her yourself.
How to find the sender of the postcard!
There is only the recipient’s ID address!
they wanted to throw out postcards at the post office, but they pass according to the tariff, but illiterate postmen convinced the opposite. I decided to pick up and find the sender so that the postcards would reach and warn the person about such a situation!
Как найти отправителя открытки !
есть только ID адрес получателя!
на почте хотели выкинуть открытки, но по тарифу они проходят, но неграмотные почтальоны убеждали обратное. Я решила забрать и найти отправителя, чтобы открытки дошли и предупредить человека о такой ситуации!
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If there is card id number too, postcrossing can find the sender.
Maybe also you can show them a photo of these and ask help here:
Hopefully it will be found out.
(You are so kind trying to solve this!)
Thank you! Thanks for the link!
Hi, as I noticed sometimes, when I draw adresses some time after midnight (local time), the “old” day still shows up as the date. So I’m curious, which time zone Postcrossing is using 
The postcrossing time is UTC/GMT.
In Germany we currently have UTC/GMT +2, which means that if you draw addresses between 0 am and 2 am local time, they still show the date of the previous day.
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Have a problem when I save my new postal address.
I got a PO Box add several days ago, which is rarely used in China today. For example, I live in a city with 8 million citizens, but only a few dozen new mailboxes are added every year, far less than the number of unsubscribes. In fact, it is now almost exclusively used by specific institutions for a short period of time.
China Post has made it clear that it does not need a postal code now. (What few people know is that at present, there is no need to WRITE a postal code to mail domestic letters in China either) The postal code has not been eliminated, but it is only used for information entry and recognition, and no longer needs to be filled in manually.
Back to my question, the address itself doesn’t have a postal code, but I can’t save it. In addition, there is a special point that the postal code of this city is different from most other cities in China, and it cannot be filled in with the first few digits +000, which cannot be recognized 
So, how do I deal with it?
Actually, PO box add even cannot be recognized in many websites in China, too few users.
Hi @MrSyu!
We understand China Post might have updated guidelines for addressing, but Postcrossing uses the UPU addressing formats for all its addresses. Hopefully this will be updated for China at some point, but for now, please check the UPU recommendations for China — there’s a section about PO box addresses. Here’s what their example looks like:
Ms. YANG Li
P.O. Box 100088-008
100088 BEIJING
P.R. CHINA
Basically, you need to write the postal code and the city in a line below the PO box number, and it’ll be ok!
Hi @meiadeleite
No offense, the meaningful of UPU formats is just the country name at the bottom.
China is not an English-speaking country, and inbound letters need to be translated and recognized before being distributed to the delivery center, at which point the address that has been recorded in the database will take effect. The add without postal code is standard and authoritative.
If PC has staff who are Chinese (not ones only understand Chinese but do not live here), I could cite many examples, 'cause there are a few words that I really don’t know how to put in English 
Hi, new here and this question has probably been answered, however, do I buy postcards from the store and mail, or do I get them off of this site and send them?
Thanks
Sassy tinker
You may get your postcards wherever you choose: shops in your community, thrift stores, online, etc. Some Postcrossers state in their profiles that they welcome handmade postcards or cards printed professionally from your own photographs, and in such cases you’re free to get creative!
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I uploaded the wrong side of the card, the message side, how do I delete/fix this. I’m talking with a child.
Where do you buy the WonderPost postcards with the animals dressed as mail carriers? I tried googling it and found a bunch of websites talking about them but didn’t find any selling them
Hello! I have a card from March 2022 that I’m 99% sure has been registered, however it’s not showing up under Received? Could it have been deleted, or is there someway to check if I missed registering this one? Thanks.
Hi!
You can search the card using the ID-code. If the card has been registered, it shows up. If the search comes up as negative, the card hasn’t been registered.
If you can’t find it under your recd list, then you will not have registered them either, because no registered cards will be deleted.