Sounds more like they have acquired a cash register scond-hand and haven't a clue how to change the date or insert their address (probably came without the original instructions). Worth bringing to their attention on that basis on a 'I don't know if you know, but your cash register is.... blah-blah-blah... and it may cause you problems if it isn't attended to' rather than approach it as being a case that they are deliberately trying to deceive.
Hope that helps and banishes the paranoia option
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Always sufficient hills - never sufficient gears
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