If you want to treat this as selling "a few" personal items, you can use Schedule D with Form 8949.
Enter on Form 8949 Use Box C or F since you don't have a 1099-B
Loss on Personal Items is not deductible so you have to enter an adjustment to cancel the loss,
the adjustment is in Col g. the adjustment code (Col f) is "L"
Gain on Personal Items is a taxable gain.
you can also adjust for expenses of sale. adjustment code is "E" or "LE".
The proceeds subtotals should add up to your 1099-K
You would not use schedule C.
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However, the IRS published recommendation is to use Other Income and report the final net gain, if any, on your sale of personal items. See the IRS website for more details.
If you are in the side gig of selling items on eBay for a profit, you use Schedule C.
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