I have had, but don't know if I can now locate, a form that a buyer would sign which shows 3 options:
1) They decline the pre-closing walk through a waive any issues it might have revealed.
2) They have performed the pre-closing walk through and are satisfied that all is as it was when the contract was written.
3) They have performed the pre-closing walk through and call attention to the following items (followed by a blank in which they can describe any issuers they want to have addressed at closing).