Those "unpaid/abandoned" storage unit auctions are public auctions, yes.
The storage place near where I live has a big sign on the street and they have them about once every 6 months. I think they also run a classified ad in the paper about the auction because I think that is a legal requirement for them to do so.
As far as would the former renter of a unit ever be able to find out who bought his "stuff"?
That is a good question and I have wondered this myself when leaving with their stuff. LOL
I do know the auctioneer takes down full information for every bidder and they keep detailed records of the winning bidders on the units, so the information is available. Just not sure if a disgruntled previous storage unit renter would ever be able to get to that information unless through an attorney or something.
Im not sure i want to go to another one of those auctions now that you bring up that question.