A list of personal items that almost assuredly have depreciated in value since purchase should suffice. You said 'most' of these items were sold at a loss', indicating that some may have been sold at a gain? If so, then you would use the steps outlined by JamesG1 above to report the gain on those items.
If all personal items were sold for a loss (or even part of them), then the 1099-K can also be accounted for on Schedule 1. In TurboTax, you'll find the entry point under the Other Common Income section.
Indicate personal item sales for type of income, then continue and mark the box that that says the amount in box 1 is too high or includes personal transactions. Then enter the amount to exclude. Note: this box is only for item amounts sold at a loss.
The personal items sold for a loss amount will then flow to Part 1 of Schedule 1, and no taxes are owed. I would wait for the prior state to contact you. Here's a list of states with lower 1099 - K filing thresholds to check if your prior state is one of them.
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