1099-K (eBay) Reporting Questions on Short/Long Sales + No Sales Proof

Hello FreeTax Community,

Like others, I too have received a 1099-K from eBay this year, whereas in previous years I have not. I am not a person who uses eBay as my business but one who sells items here and there throughout the year. The previous year was abnormally strong for sales so I breached the $5,000 limit that triggers the 1099-K. Now I'm trying to figure out how to navigate it so that it doesn't trigger an audit.

As I work through inputting the 1099-K, which I am doing through through Income → Common Income → Investments and Savings → Personal Items (1099-K), I have found that the option that comes up is either a short or long term sales. Well, I have both. Some items I bought in 2023 and sold in 2024. Some I bought in 2001 and sold in 2024. FreeTaxUSA only allows you to choose either short or long. How am I to represent them both because choosing one or the other has drastic price fluctuations for how much I owe.

Also, some of the items I sold I purchased (or were gifted) many years ago and have no way to provide any proof of purchasing. How are these supposed to be represented when itemized out?

Thanks for anything you can provide!