"Remove all cards from In-Transit" should make them go back to wantlist. Not entirely sure about that though. You would have to do it by set, name or team though.
EDIT: Nevermind! That doesn't work that way. I tried it and it removed the card completely, not to wantlist or to collection. Looks like one-by-one is the only way to go there.
NO PWE's EVER!!! PLZ PM me 1st before sending any offer. ONLY selling cards as of March 2024. No trades or purchases right now.
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Largest total PC card collections by Team, then Athlete (as of 3/22/24):
STL Cardinals (MLB) - 8810; Carolina Panthers - 2888; GB Packers - 1790+ cards
Mark Martin (NASCAR) - 2038 cards; Jimmie Johnson (NASCAR) - 1875 cards; Jeff Gordon (NASCAR) - 1594; Ricky Rudd (NASCAR) - 839; Ozzie Smith (MLB) - 707