Bumps or air pockets on laminated IDs could show that an ID has been altered.
When an ID is laminated once issued, it is done in a professional manner such that there are no bumps or air pockets.
If this changes and bumps or pockets of air appear, there is a strong possibility that the lamination film was removed and then the ID altered after which the lamination film was then replaced.
The other options are incorrect because:
If air bumps or pockets appear on a laminated card, the card could have been opened and altered.