If you sold used clothing and toys for less than you paid for it, you would have realized a nondeductible personal loss. You would not report the sales, and you wouldn't claim a loss. It wouldn't be reasonable to expect you to produce purchase receipts for these items, but if you sold a significant amount of these items, you should retain a list of what you sold, what you sold it for, and an estimate of the original purchase prices/ages of the items in the off chance that these transactions were ever questioned. As an aside, your cost basis of items received by gift (from your relatives) is actually what the item cost the giver.
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