I recommend removal if I see them. These are a couple of boilerplate comments that I use. The second one usually gets people, and I never even mention termites, just mice, spiders things such as that...

The foundation/pier/walls are not visible due to form boards left in place. Since a visual inspection of the foundation/pier/wall could not be accomplished, no representation of the condition of the foundation/pier/wall can be made. Recommend removal of form boards and any unused/discarded material.

Construction debris left in place in any void or normally concealed/enclosed area can and will attract insect/vermin activity. Recommend removal of all construction debris and related material as a deterrent to insect/vermin activity.