You are correct that entering the itemized list on form 8949 will give the IRS the information on the sale of personal items and that entering the cost the same as the sale price will zero out your taxable income. This is recommended especially if your 1099-K represents a variety of different types of income. If, however, your 1099-K is for a minimal amount and it is all for non-taxable reasons entering the total amount into the miscellaneous income section with a short description (sale of personal item, reimbursement by family, etc.) as both a positive and a negative should do the trick.
@stantonporsche
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