The issue though is since the box is so expensive (4 cell phones, custom boards, etc) stealing it was likely a felony.

So you'd have to admit to a felony to sue or press charges against box maker. Second when committing a felony, in many jurisdiction the felon is automatically on the hook for any further 'bad things' that happen during the crime up to and including deaths. So if the felonious package thief got in an accident while opening a stolen package, it could all fall on them as a matter of statute in many places.

What if I just buy something very stupid that could scare someone but I actually wanted it for myself? Or what if I actually bought the same device in the video but I wanted it for some other use or for checking out how it's made?