My accountant said yup, they will take 28% regardless. Worse still, if you can't show the original purchase price they will assume that all of fair market value is the "gain"; so it would be 28% of that full amount! The examples on investopedia also agree with this. It's just because a 1099K (?) isn't auto-generated by PayPal/ebay (yet) until you go over 20k or so that we have ignored this. Apparently, we should have all been paying 28% on every Nintendo Fiber, POG, and NES cart I'll just claim the "turbo tax didn't have that box" defense in the future.
I look forward to hearing what they say! Thanks!