Yes. The pawn shop has liability to you either under a pawning agreement or under the general law regarding "bailments." In other words, the pawn shop owes you for the item (less the amount you would have needed to pay the pawn shop to redeem your item). If the pawn shop cannot provide a thing or an amount of money to your satisfaction, you potentially have a claim against the pawn shop. Your biggest problem will be determining the value of the thing pawned and showing by how much that value exceeded the amount of the loan.
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Assuming you were current on the pawn shop obligation you have a right to seek the replacement value of the item pawned. As the prior attorney said you have an evidentiary problem is proving value of the item.