Thanks, everyone, for your constructive advice. As for the poster who thought my tale sounds fishy, it is the truth. Yes, it was not the brightest idea to leave my passport, etc. in the backpack in the closet, but there was no lock box in the room and I was in a hurry to get to work and didn't think about securing my items more properly that morning.

The chain is Intercontinental Hotel Group. On one of my emails to the hotel, I copied an executive at IHG as well as the head of the hotel group that is the franchisee of this particular hotel.

I think contacting the police again is a good idea and will do so.