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It was in the middle of the night after even the cleaning crew left.

Tho, I don't know how he managed to carry 30 of them in one go, or what he did with them after he left. I guess the number is a bit dramatized.

I didn't see mention of doing it in one go. I presumed he went at least three times.

It specifically mentions that he waited until late at night after everyone went home.

It was after hours...