Of course, if he logged in on one clock and logged out on another, it would be theft, not owning false scales. Here, I’m only talking about owning false scales.
How could it come to theft? One could be talking on their portable phone and say, “oh, it’s four o’clock” without remembering that the clock is wrong. Or one could take a call in one room and walk around talking, then think they were on for forty-five minutes when it was only a half-hour.