Skilly, you may be as well PMing Admin at
ICR to see if they can suggest anything - maybe they have safes to hire?? Don't want to worry you, but money /travel cheques can be replaced, but what about your passports?
Also, we've stayed where Di did where you need 2 keys to open your safe which is in the office, but have stayed at another place too where the "hotel's" key was freely available and guests just helped themselves to it from an open drawer in reception and there were never any staff in there, so best make sure you are well insured and as always on your guard