I would think that if a pawn shop hasn't had an ongoing record of high rates of stolen property reports that they are probably in the clear if they at least get enough personal info from their property sources.

Pawn shops pay taxes, so local police might not want to bother them unless perhaps a certain rate of complaint is exceeded.
Their prompt refund of money and surrender of stolen property might be enough to show good faith on their part that they are not trying to profit from receiving known-stolen or likely-stolen property, but their treatment by the legal system might depend on which police agency that evidence and/or a complaint is/was filed with, i.e. city, county, state or federal.