I'd talk to the pawn shop and remind them it is their duty to make sure they are not taking in stolen goods and that if you have to get an attorney you will file a negligence suit against them for any fees you incur from the attorney and court fees.
This is exactly why I have a legal service. Cost me less than 30 bucks a month and they take care of things like this for me.
Sorry you have to go through this. Lame on the cops to unless you can't prove they are yours (have record of the serial numbers).