Broken stock and a bent barrel, that is essentially what a soldier (or anyone) would have done to disable a captured/discovered weapon in the field without tools.
Its been awhile since I read the manuals but these actions and others were described for dealing with unwanted weapons or to prevent their capture and use. Also included plugging the barrel with mud and firing a round remotely with a string, removing bolts and critical bits to discard in water, swamps, bogs where-ever, and so on.
While the weapon may have been turned into stores, there is little way of knowing where it actually came from.