You should re-create records (which can be as simple as writing on a piece of paper). Note everything you can recall about each sale (come up with a date, amount paid, how paid, where purchased). Then, calculate your gain/loss on each sale by taking the amount it sold for, minus expenses to sell it (shipping), minus your cost. As long as overall, you have a loss, you do not need to report it but you should document it as such.
