audiogon does not remove items after a sale. i think maybe it may have been canceled. They list sales until the whole thing is done shipping and transaction as I have dealt with them for years. I have canceled my add and they cannot be found when you cancel. All sales stay on. Could be the seller canceled the add
I think that he "canceled" the add right after it sold - so as not to have others message him about it. They do it all the time with certain items such as when Rawson first started to do his First Watt DIY work.