File a police report (the police will try and talk you out of it) and then report it to your insurance company. It's unlikely the items will be found. If they are they will probably be damaged. If you find them offered for sale online or in a 2nd hand shop or pawn shop report that to both the police and your insurance company.

Society is made up of all kinds of people. Not all of them are scum of the earth and not all of them are ethical beyond belief however, all of them get what they sow.