I have some long term gains on sports cards that were purchased around 10 years ago. I have the paypal emails from when I bought the items showing the item name, date, and cost. Would this be sufficient documentation regarding basis?
I don’t see any problem with that documentation. Note that although sports cards would seem to be almost prototypical examples of collectibles, the tax law provides a specific definition under which only certain enumerated items are considered collectibles, and that list does not include sports cards.