At one time my local department had two Thompson Model 1921/1928 .45 submachine guns with finned barrels, Cutts compensators, and vertical foregrips, complete with hard cases and 50-round drums, as well as 18 Reising Model 50 .45 submachine guns. They also had a German StG-44, a very rare WWII assault rifle which belonged to an officer who committed suicide in the late 1960's and was given to the department by his widow.
My dad was the armorer for the department in those days and I spent a lot of time in the armory and knew those Thompsons well. If I recall, they had 3 or 4 digit serial numbers.
I don't know if they're still there or if they were traded for more modern weapons, last time I saw them was in the mid-1990's.

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John