I dunno, I think something like [1] could do a pretty good job of putting the zipper back together and then you would just have to remove the underside component at the very end and then jiggle the existing zippers to hide the fact that it had ever been opened that way.
I suspect there might be even more surreptitious versions of such tools.
I suspect there might be even more surreptitious versions of such tools.
[1] https://guide.sportsmansguide.com/tips/camping-101-quick-fix...