Size:  (not chosen)
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Located on the roof of a small building of unknown origin...
The stash is a plastic bag containing a CD with Dr Alban (I had to get rid of it. I'm not a fan of Dr Alban...) It's located in Gothenburg near Chalmers University of Technology. I cannot tell if it is still there since I moved to Singapore, but according to the rumour, it could be gone by now.
(No hints available.)