There is a discussion in the
Peachtree thread from about 70 on about this very thing. One of the robots got modified during a finals timeout. Upshot of this is a re inspection can be as simple as grabbing an inspector an showing him what you are doing. It is up to the inspector to decide the level of reinspection required.
Anything that is part of the robot at the beginning of the competition is supposed to be inspected. The advantage of presenting mechanisms not installed but may be at the initial inspection is you can take them on & of at will without having the robot reinspected. If the robot changes appearance substantially, you might want to let the Referees know that the mechanisms were inspected though.
If you recall the minibots in logomotion went from all sorts to 1-2 designs in less that a week. Of course they were not required to be bagged.