[nerdcorp]

The problem Is, there were no signs of tampering on the package.

Couldn't they have ripped the tape off took the package put books inside and resealed it?

Normally there would be evidence of that it's hard to rip tape off a box without ripping the first layer off the box with it

No worries, I've thought about that and left a few ripped of tape marks. around the box.