goofy mess

Hello! Got a good one for you. Bought a 93 jgc ltd @ auction. Good junk is hard to find these days. The motor and tranny and running gear in good shape. Radio does not work. The infinity amp appears to have been replaced with some sort of transeiver-(early cell phone-wyfy-or whatever). [Transeiver Unit Fujitsu America Inc. Draw no. m018-2048-coo3] The question is this: Did this package exist for police cars? and if so are there sources available to find out what was done to the stock radio system so that it can be returned to it's normal use?