Looking for some info/help, here is the story:

Son parked illegally in Philadelphia, tow truck driver picked up his car and his gun fell out of where he had stashed it(he does have a CCP from Delco)
Police were called and they broke into his car and confiscated his gun. We sent 2 letters to the Chief of Police requesting return of the firearm as was the
direction given to him by police. After 3 months he finally got a letter that stated that they needed to do an investigation. Another 3-4 months went by and he
got a letter from detectives who did the alleged investigation stating that the police after doing an investigation by the detectives found that it was "not feasible to return his firearm" and it he wanted he could file a petition in Common Pleas Court for the return of his property.

Has anyone had this happen and were you successful in the return of the firearm? Frankly I think this is BS but I am trying to keep a cool head.
Son has never been in trouble with the law.