Understand that with "police trade-in" firearms - and with former cop handguns particularly - while some no doubt have seen a high-round count, most were really only fired at qualification time, that being the annual or semi-annual ritual most rank-n-file cops mistake for "training."
Anyhoo, the mantra of "carried a lot, shot very little" applies to most cop trade-ins.
Many won't have been cleaned very well either, but once you get the old grease or oil and other gunk flushed out, you might be pleasantly surprised at what you have.
Mine was a much-carried, little-fired former L.E. S&W 4566 that I got for a steal some years ago.
Once cleaned, the barrel looked pristine, and the only wear signs were scratches on the grips and some holster rub on the slide near the muzzle. Novak tritiums were still GTG. Put about 400-rds thru it first (great accuracy and fed
any ammo), then ordered new-in-the wrapper grips from Smith, which they still stocked back then.
After that, I decided to go whole-hog, so I shipped it off to Tripp Research for hard-chroming. Still looks like a new gun.