More than once I kind of recall. Also got a few being in the wrong category. Good example is something buried in memorabilia or collectables. This is especially strong when a category search is required to get the item you're looking and even more if the item has tons of other listings to further hide.
Lastly there's the good old sniping auctions in the morning hours, very effective in the UK because there's not going to be much of anyone outside the one timezone.