Ah, yes, the mystery bottles. I've had a few of those back in the bottling days. Its always fun to guess what kind of beer it "was".
I've got about 3 litres of brew in a keg that "was" Dunkel, and is now just dark, wheaty beer, apparently sitting warm for several days when I was out of town did it no good... still tolerable, but probably will be dumped to make room for one of the four things I have in primary now.
Its nice to know that there is 80+ Litres in primary!