One-half of Deux Lectrices, writing about the things I read.
When he’d hidden the piece in this wall, he hadn’t had the time nor the inclination to put it back exactly the way he found it. He’d patched it up so that it could be easily accessed if he ever needed it but stand up to scrutiny at the same time.
Look, either the wall isn't "put [...] back exactly the way he found it" or it can "stand up to scrutiny." There isn't an either, unless, as a better author would've written, people rarely come down there and the ones that do never really stop to look at the walls.