I used to Ebay (buy) quite a bit over a year.
I stopped using the proxy bid because it ALWAYS (and I mean ALWAYS, not even one exception) won the item at my maximum possible bid.
When I stopped doing the proxy, I would win auctions at lower than my max bid.
So, I was convinced there was some way for the seller to figure it out. You may swear up and down they can’t, but I go by experience. However this was many years ago and so Ebay may have tightened it up. On the other hand do not underestimate human ingenuity at screwing you out of money.
This was similar to my arguing with my stock broker many years past where he insisted on stop sell orders (to trigger a sell if the stock declined to that amount) as a safety net. I had noticed that in my more thinly traded stocks that this sell order often seemed to be triggered only to have the stock come back up. It was like people KNEW that my order was there and could manipulate it over the course of a few minutes to pick it up.
My broker insisted it was impossible but I stopped doing the sell stop orders anyway. I then found out a couple years later that there WAS a way to see my order. :rolleyes:
Don’t give up information…someone will find a way to find it out and screw ya.