MPDC switched to their 7/800 MHz P25 trunked system in 2013 and shut down the UHF infrastructure shortly thereafter.
The Astro Sabers were in circulation since the mid/late 1990s. First only in analog and in 2003 in digital when the department went to their smartzone trunking system.
I don't recall the date, but a few years prior to moving to 7/800MHz in 2013, MPDC encrypted their UHF system. At that point, the department pulled all the Astro Sabers as they did not have encryption modules installed and portable users went from a mix of ASII's and XTS radios to XTS radios only.
So your ASII likely has been out of service for 5+ years, but likely more than 12 years as the vast majority of the department had transitioned to XTS radios in the early 2000s.