Mike at work is putting them into a nicer looking format than I can manage, so this is the draft version of the "jumping off" point for the induction. Alongside this there will be a UV torch hidden in the room (the clue emoldens time to show them where to look).
On the back of the above clue will be the real puzzle! It will be written in "invisible ink" that is only visible when the UV torch is shone on it.
a) How many items an Undergraduate can borrow x Floor where the DVDs are
b) How many items a Postgraduate can borrow / Floor where you take out books
c) Where the reservation shelf is
With materials in the room that will help them work out the answers. This gives a 3 digit code to open a padlock in my "special box" that will reveal the next clue...