Golden cans in corners?

(First of all I don’t know if this should be in “Off-Topic” or “General Discussions”.)

I’ve wondered for a long time why there are guldburkar (:uk:= golden cans) in the corners in some (or most) buildings/facilities/bunkers?

Pyttipanna (Corned Beef Hash)

The real deal
Source: Karlskronas Marinuseum (and DigitaltMuseum)

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