I'm not saying it's the easiest way nor the best way but it should be done with an object that decompose itself at a measurable rate.
That way we could estimate the decomposition/decay over those 3 seconds versus what state of decomposition it has once it's has been teleported to the Moon and back.
By comparing the results we could see if there have been a significant alteration in its "timeline" so to speak.
While it may save objects or living organism from the effects of "time" I do not think it would be the gate to traveling in the past as something similar to what happens in Back to the Future.
Well that's just my take.
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