OK, checking the ones at work didn't help, I ran the flash code and it still comes up as just SmartNet.
I the way to do it is:
See if there is a flashcode sticker added to the bottom that shows it was updated sometime around the late 2000's time range. Ours were done in 2008 before we rebanded.
Check the serial number and run it against one of the tools avialble on the web that will tell you when your radio was built. Again, look for the late 2000's time frame.
Or, plug it into CPS and read it.
On the trunking system personality pages, specifically on the failsoft tab, there should be two columns, one for pre-rebanded frequencies, one for post rebanded frequencies.