I assume this issue relates to a personal tax retun. Bottom line , I would do an ammended 2021 return. Do Not ignore the IRS .Contact them.
1) Get a tax program that includes schedule C. I use TT Home and Busines
2) Redo your tax return as it was.-
3) Redo using Sch. C- sale + cost of goods sold. I assume Ebay gives you the proceeds net of thei fees.. The IRS only has the income
4) Do 1040-X to show the changes
The tricky part is what value you put on your cost of goods sold.. The IRs may inquire
