I recently updated the Postcard Milestones table on the Postcrossing Wikipedia page, but I could use some help with references and postcard numbers for some of the Million Milestones.
Can you help? Feel free to simply update the Wikipedia page yourself, or if you’d prefer, just reply to this post with the links or card numbers so I can update the page.
You should find all relevant ones on the official Postcrossing blog, using the tag milestone:
Thank you for that link. I did actually use that already for filling in all the references that I could, but if you check out the Wikipedia page, you’ll see there are rows for each million milestone up to 26 million, but the blog only seems to have 1 through 5, then 10, 15, 20, 25, and 30 before jumping by 10 million.
So, we’re missing 6, 8, 9, 11-14, 16-19, 21, 22, and 26. Those are not listed in the blog.
Beforehand, thank you for updating the Postcrossing Wikipedia page — it’s appreciated! 
Today I had some time to dig this up and, if I didn’t made any mistake, this is the full list:
| Million | Date (UTC) | From | To | Postcard ID |
|---|---|---|---|---|
| 1 | April 11, 2008 03:03 pm | Turkey | Romania | TR-8482 |
| 2 | February 26, 2009 06:34 am | Germany | Norway | DE-292437 |
| 3 | September 24, 2009 04:09 pm | Finland | Slovenia | FI-637138 |
| 4 | March 28, 2010 10:14 am | Czechia | Netherlands | CZ-48446 |
| 5 | August 24, 2010 07:14 pm | Italy | Thailand | IT-98823 |
| 6 | December 30, 2010 12:03 pm | Spain | Germany | ES-97547 |
| 7 | April 19, 2011 06:59 pm | China | Netherlands | CN-357628 |
| 8 | August 02, 2011 11:28 am | Finland | Japan | FI-1149781 |
| 9 | November 03, 2011 05:13 am | China | Russia | CN-450151 |
| 10 | January 27, 2012 04:56 pm | Japan | Germany | JP-232027 |
| 11 | April 03, 2012 08:04 pm | U.S.A. | Iceland | US-1615550 |
| 12 | June 12, 2012 06:28 pm | U.S.A. | Netherlands | US-1710034 |
| 13 | August 22, 2012 05:08 am | Hong Kong | Russia | HK-45392 |
| 14 | October 25, 2012 08:52 pm | Netherlands | U.S.A. | NL-1464473 |
| 15 | December 31, 2012 01:46 pm | Germany | Italy | DE-1800737 |
| 16 | March 04, 2013 07:21 am | Ukraine | Russia | UA-487482 |
| 17 | May 01, 2013 12:20 am | Russia | Australia | RU-1658153 |
| 18 | July 03, 2013 06:57 am | Finland | Taiwan | FI-1791281 |
| 19 | September 02, 2013 09:56 am | Latvia | Germany | UA-737378 |
| 20 | October 29, 2013 05:49 am | Taiwan | Taiwan | US-2449004 |
| 21 | December 23, 2013 10:54 pm | Netherlands | Italy | NL-2232945 |
| 22 | February 17, 2014 03:03 pm | Netherlands | Poland | NL-2339217 |
| 23 | April 10, 2014 10:47 am | Germany | Australia | DE-3043747 |
| 24 | June 08, 2014 12:40 pm | Latvia | Japan | LV-150063 |
| 25 | August 10, 2014 11:02 am | Netherlands | Germany | NL-2612179 |
| 26 | October 10, 2014 03:36 am | U.S.A. | Hong Kong | US-3009516 |
| 27 | December 07, 2014 02:05 am | Japan | Taiwan | JP-612910 |
| 28 | February 05, 2015 07:13 pm | Netherlands | Germany | NL-2863567 |
| 29 | April 02, 2015 04:04 pm | Netherlands | U.S.A. | NL-2930266 |
| 30 | June 02, 2015 12:27 am | Germany | Portugal | DE-4221494 |
| 31 | August 05, 2015 11:39 am | Netherlands | Philippines | NL-3078076 |
| 32 | October 06, 2015 06:40 pm | Romania | U.S.A. | RO-109708 |
| 33 | December 05, 2015 11:37 am | Netherlands | Japan | NL-3242698 |
| 34 | February 04, 2016 07:41 pm | Finland | Germany | FI-2619857 |
| 35 | March 31, 2016 11:49 pm | Hong Kong | U.S.A. | HK-407034 |
| 36 | May 31, 2016 06:34 pm | China | U.S.A. | CN-1943122 |
| 37 | August 02, 2016 07:08 pm | Russia | U.S.A. | RU-4866496 |
| 38 | October 04, 2016 04:09 pm | Netherlands | U.S.A. | NL-3579375 |
| 39 | December 07, 2016 07:56 am | Taiwan | U.S.A. | TW-2105862 |
| 40 | February 13, 2017 06:39 am | Taiwan | France | TW-2118751 |
| 41 | April 17, 2017 10:46 am | Czechia | Japan | CZ-1159412 |
| 42 | June 28, 2017 06:15 pm | U.S.A. | Germany | US-4715663 |
| 43 | September 02, 2017 02:23 pm | China | Germany | CN-2281671 |
| 44 | November 07, 2017 10:46 pm | Russia | Costa Rica | RU-6019041 |
| 45 | January 16, 2018 06:26 pm | Australia | Czechia | AU-590448 |
| 46 | March 20, 2018 06:00 pm | Germany | Russia | DE-6951547 |
| 47 | May 28, 2018 08:03 am | U.S.A. | Taiwan | US-5301280 |
| 48 | August 07, 2018 03:47 am | U.S.A. | Thailand | US-5456394 |
| 49 | October 16, 2018 01:32 am | Russia | U.S.A. | RU-6804601 |
| 50 | December 27, 2018 07:13 pm | Israel | Russia | IL-60207 |
| 51 | March 04, 2019 10:56 am | Slovenia | France | SI-174914 |
| 52 | May 13, 2019 05:47 am | Russia | Russia | RU-7247664 |
| 53 | July 25, 2019 05:25 am | U.S.A. | Sweden | US-6129158 |
| 54 | October 07, 2019 05:27 pm | France | Russia | FR-1208264 |
| 55 | December 18, 2019 04:56 pm | Germany | Belgium | DE-8811634 |
| 56 | February 28, 2020 11:49 am | Netherlands | Russia | NL-4570321 |
| 57 | June 05, 2020 07:15 pm | Germany | Russia | DE-9251821 |
| 58 | August 28, 2020 09:17 am | Czechia | Germany | CZ-1723155 |
| 59 | November 10, 2020 08:51 pm | Taiwan | Germany | TW-3064528 |
| 60 | January 25, 2021 10:17 pm | Belarus | Czechia | BY-2711325 |
Oh my word, this is incredible! Thank you!! 
It’ll take me a little bit, but I’ll get this all added into the Wikipedia page. And this post should work well as the source/reference since it came directly from you @paulo.
It actually went quicker thank I thought it would to update after I wrote a script to parse and format the data from your table into Wikipedia’s markdown.
Thank you @meiadeleite for tagging Paul, and thank you @paulo for getting the data so quickly!
You are welcome — thank you for updating that page! 
In the interest of transparency, and for anyone else who may find the script useful, I’ve posted it on GitHub:
https://github.com/dynamiccookies/postcrossing-wikipedia
I realize this is a one-off script specific to this individual post, but you may be able to tweak it for your needs.
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