yeah, in this case spell scrolls were a good way to give players both a set of tools they can use to plan their heist around, and a reason to steal something other than their primary target. i imagined a scene like: "ok, we need x-ray vision for this, so let's first spread out and find where it is."
(oh... i just realized that players have no reason to know there are scrolls in the halls. maybe we'll update the adventure once the rating is done)