2208 would be a new APX radio on the old system, All the cars are getting the new radios over the next few months, a 4 digit ID is a new radio on the old system, if they talk on the P25 system its 1802208
Ever since I found out they were doing it I have been running trunker on the new and old systems, Lots of new talk groups popping up on the new P25 system and a lot of 179XXXX, 174XXXX, and 180XXXX ids also 591001 keeps coming up on TG 40, 4 days in a row now only once was there voice but I missed it. Get trunker or Pro96Com and run the new 700 system, you learn alot