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Strict Recall Rule
(lemmy.ca)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Not only that, depending on where this vending machine is, it could be nothing more than a leased spot with the actual machine, inventory, and access keys owned by an off site company.
While the sign could be the best that employees of whatever store could do
Could just unplug it.