Player cards, more examples here: http://dota2.gamepedia.com/2014_Player_Card_Pack
Accounts who were active during 2013 and 2014 should be expected to have player cards, but instead of deleting/removing them, you can use the player cards to be recycled as charms. Yes, you heard it, I may not have any screen or video proofs but it is possible, all items in DotA 2 can be recycled as charms, and unused player cards are no exemption.
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