I hate to play devil's advocate, but man are you guys crazy? That money is LONG gone! Anyone daring enough to steal from under the nose of someone who is providing a generous service to others certainly will not have an ounce of remorse, let alone the morality required to return the money!
Like Reefhawk1 mentioned, you should file the police report immediately and provide the names of all individuals who were at your home/store.
I'm sure the innocent would not mind being questioned on the matter, as the minor inconvenice is more than ofset by the clearing of their names and the resolution of your possible suspicions of them.
Seems to me at the end of the day a lesson has been learned hopefully.
