If you were sitting there and you appeared from the future and handed yourself a box, then you never opened it until one day you get sent back in time where you give yourself that exact same unopened box…
Who physically constructed the box? It didn’t exist until future you came through to give it to yourself, you didn’t make it, and you give it to yourself later after you time travel… so where did it come from?
Who can guess what’s inside the unopened box?
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