I used to work for a storage company about 15 years ago and we'd have auctions. Half of the guys just couldn't pay their rent and tried, sometimes they'll catch up on their rent but fall behind again. The other half go missing. Usually see the same buyers at the auctions who sell stuff at the swap meet. The doors to the storage locker are opened and the buyers get to see inside. They're not allowed to go inside of the locker or touch anything.. A lot of times it's old clothes, old furnature, and worthless stuff and the locker sells for less than $100, usually not worth the effort of throwing stuff away.. Most of the stuff is in boxes so you don't know what's inside. Sometimes you'll see nice furniture, TV's, and other stuff when people move homes and those can go for a couple thousand dollars and up but that's uncommon. Usually the computers and electronics are obsolete.
We've heard rumors of people finding guns before, but we don't care as it's the buyers responsibility and we don't usually get to see what they find. A guy in Florida called and was surprised to find his locker was auctioned a few months ago. He was angry and made death threats to me because his guns were in the locker. There's a stipulation in the storage contract that no firearms can be stored.