Has anybody seen similar markings on a stock like these?

[browningautorifle]

a pointless order that would quickly become irrelevant in the chaos of combat.

Or if the stocks got switched during a cleaning session in less than ideal conditions.

[RCS]

I recall seeing notes pasted on the trigger housing inside on the bottom of the magazine well with sight-in numbers both on
returns and on some US rifles and possibly a few National Match rifles