Our keys generally had "do not duplicate" on them but that was only as good as the person making the copy. Some keys require special blanks that have to be ordered by an authorized individual. Those are a lot more cumbersome to copy so that is an added measure of protection.
There is really no reason an employee should have duplicates of bank keys made.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell