For some reason the Search function here isn't working so I thought I'd ask here.

Travelling in the lava section of the world I found a lone house with an unhackable safe on the second floor. Beside the safe is a skeleton with a Goodbye Letter with what is obviously clues to the safe combination. The last line is something about 4 dark-haired beauties.

Has anyone worked this out yet? I've tried various combinations but no luck.

I ran into the same goodbye letter on a skeleton beside an unhackable safe in Xacor last night. So judging from the fact you found it elsewhere, I'd say it's a red herring and has nothing to do with the safe. I looked all over the house (spent probably a good half hour) and found nothing to indicate what the combination might be though, so maybe I'm wrong.

SPOILER

from Steam forum 7391, supposedly according to 4 letters there, although I only found the 4 beauties one.

Thanks. I'm miles away but I'll go back and see.

I'm sure it makes sense in German.