Try messaging the LocalBitcoins sellers in Amsterdam.
Perfect.Makes process so much easier.
I doubt that you'll get it back. Maybe another patron got it and not the restaurant itself. If that happened don't expect to get it back. Or the restaurant people split it among themselves, that's also possible.
Dude,where do you live ? Is there so much negativity there ? People aren't that bad ,third world country scammers do that on the internet,not highly paid hotel staff in Amsterdam.