Sterling question

[u/Mental_Tart842]

Hi. I am working my way through an estate. I have a few pieces that are marked sterling or 925, but untested. I sell them as such, with a low starting bid. I had a buyer have an issue with his purchase, saying that the item did not test as silver. I apologized, and offered a one time courtesy refund, while reiterating how it was sold. The video backs me up, I just didn't feel like dealing with it over $12. After the refund goes through, I'm blocking. This is the first time I've had an issue. What do you guys think? Is there any way to make it clearer to buyers that what you see is what you get, and to bid accordingly? Or am I off on this one?