When you inherited the items in 1995, the basis in those assets were "stepped up" to the fair market value at the date of death.
If the items are "collectibles" (particular crystal items and figurines, for example), you can report the sales on Schedule D and have a reasonable estimate of your basis to offset the $400 received.
If the items you are selling are not collectibles and you are engaged in a hobby, for tax year 2022, you will not be able to deduct the "cost of the goods sold."
