According to Invaluable.com the Boss 20 bore lot 1337 was "sold" at $25,000. With Palunc's info we know that bid did not reach the reserve. I like invaluable, but they do not always know the reserve price, and you are left wondering whether the price listed resulted in a sale or not. They are often correcting their results a few days later.
Generally, I was amazed at the number of guns with 26" barrels. It seemed like 75% of the nicer doubles had short barrels. I personally don't like the handling dynamics of guns <28". I have one 26 1/4" gun and I am about to sell it for that reason. I looked at each gun in the auction, but none fit my desired criteria, many of them knocked out due to barrel length.