It's not unheard of that travellers will buy a cheap bike, have 'questionable' paperwork and money and find it way cheaper and easier to just abandon the bike and do a runner.. There are vehicles all over the world like this. Left in limbo....
On the other hand, this guy could of had a family matter to attend to or ended up in Hospital and is worrying about the bike left behind. A mystery to be sure.
I find it VERY strange that they said nothing to the 'Shed owner' You would think if you've had enough of your trip and need to make a sharp exit, you'd throw the keys to the land owner and say "Enjoy yourself"...
Is this shed on a guest house/hostel ? Who is in charge of the bike ? Are there keys, paperwork ?? Is it the model with the ignition or just a kick start ?
I would take pictures of the bike (not the frame/engine numbers) and put it all over the relevant websites. HUBB, ABR, ADVrider etc.
2001 NX650 Dominator.
BMW Dealer Technician
Ushuaia - Colombia 2007/8
UK- South Africa 2010/11
S.E Asia 2014
U.K - Magadan 2015