Sorry to say but I guess these are the ugliest coin on the forum, I mean from no way these looks like platinum coin. It looks more like "disabled" coins. Even though I know these are platinum coins but every time when I see Satoshi's user and these 5 coins my mind says yes these are "disabled" or "in-active" coins because Satoshi's account is inactive.

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regarding OP's very interesting questions, I guess posts were not deleted because all posts exists but on different topics, here I found how to confirm this

sirius post # 200 on February 02, 2010

Then from post#201 - 211, 300, 400, 500, 600, 700, 800, 900, 1000 - 5000, 10,000, (20000 x), 30,000,40,0000, 50,000, 60,0000  i checked all are posts exist

You can from this using merit link, just change the post id

Post # 201 = https://bitcointalk.org/index.php?action=merit;msg=200
Post # 211 = https://bitcointalk.org/index.php?action=merit;msg=211
Post # 10000 = https://bitcointalk.org/index.php?action=merit;msg=10000
.....
Post # 60000 = https://bitcointalk.org/index.php?action=merit;msg=60000

Until PrintCoins post # 665348 in the welcome thread after sirius post # 200
https://bitcointalk.org/index.php?action=merit;msg=665348

From this I can conclude, no posts were deleted (yeah may be few here and there but no big dump deletion by theymos) and almost all posts exist on different topic.

You can get the exact post and topic link if you know how to? Don't ask me

For example

Post #201 https://bitcointalk.org/index.php?topic=30.msg201#msg201
Post # 999 https://bitcointalk.org/index.php?topic=117.msg999#msg999
Post # 30000 https://bitcointalk.org/index.php?topic=2209.msg30000#msg30000
Post # 60000 https://bitcointalk.org/index.php?topic=4138.msg60000#msg60000