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.
Consider also the cost of shipping and that reward you are offering. It might be more expensive than the items you lost.
If those things are very important lets say its included with his legal documents and stuffs then it would still really worth to pay up the expense but if those are just things cost $100 in total then i guess its not really wise to get those things back seeing on the money you will spent on getting it back maybe those things are important.
Not THAT important, it was just makeup that I can't get elsewhere and I would really love to have it back.