That said - and getting back towards the topic - I remember a good few years ago a nearby ATC Sqn having its .22 rifles stolen. Armourers arrived to carry out the routine six monthly inspection and servicing, but needed to take the weapons away for some remedial work. The Sqn staff were somewhat taken aback when the real armourers from the PU turned up shortly afterwards....... To be fair, we weren't 100% certain we wouldn't have fallen for the same con.
Similar but an exercise happened at Odiham if I remember correctly. Landrover with pongoes turns up at gate one evening, officer says taking his chaps out for end of exercise pint so can we secure their weapons in the armoury, duty armourer called out and opens up shop, that's when they revealed they were not real pongoes, but a security check, Landy had tax disc in window etc