If I was you I would get the friend's you trust & know did not rip you off go & recover your dads stuff.go to their local dealers & ask around,tell everyone the cops are involved.Let everybody know that if they return property its going no further.If that does not work go & beat the fuck out of your supects.Harsh yes,but if you do not do something you will all ways be a victom.I will beat your ass over a dollar if you stole it from me & have been in handcuffs over 10 dollars.Stand up to those punks,everyone hates a thief.