I rarely buy or bid on guns at online auctions. Mainly because the fear of hidden issues makes me leery of what I might get. I do live about 50 miles from one auction house and if I see something really interesting I will drive there and do a hands on inspection before bidding. Since their auctions are only online those living close enough have a real advantage over those who can only read the descriptions, and look at pictures.
I've discovered some pretty major errors that I sometimes reveal if I'm not interested in a gun, but I also have discovered some errors that would make some guns real bargains to anyone who looked at them, but unattractive to those just looking online. I've picked up a few items there for 1/4th of what they are worth if the descriptions were corrected.