According to IRS 1099-K guidance, you should only report items that qualify as trade or business income. If the items you sold were used in a trade or business or if you were selling items as part of a business (inventory), you will need to report them. But based on your explanation, this is not income. You are just selling personal items as a loss.
If my assumption above about selling personal items at a loss is correct, you do not need to report this income on your return at all. There is a chance that you will receive some correspondence from taxing authorities when you file your return without reporting this income. Keep good records of the transactions and respond promptly to any correspondence you may receive from taxing authorities.
@Redreserve
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