Call the police. Provide them with serial numbers if possible. That way, if they end up in a pawn shop, they can be identified/declared stolen and possibly returned to you.
Contact your ISP. If you happen to know the MAC addresses of these items, they may be able to track them if they're ever reconnected to their network. It's unlikely, but your ISP may be able to actually provide you with the MAC addresses as well.
-Wolf sends