It's not Schedule C it's Schedule D / Form 8949
Loss on Personal Items is not deductible so you have to enter an adjustment to cancel the loss,
or report the cost same as the proceeds.
Gain on Personal Items is a taxable gain.
Use Box Category C/F since you don't have a 1099-B
The proceeds subtotals should add up to your 1099-K
If you use the adjustment (recommended) the adjustment code (Col f) is "L"
@barkinglobster
