One had to go along the wall by the gargoyles, like ....ALL around the walls of the gargoyles. When you lost important things you had to let the head of your school know 'cause see, if the Headmistress knew then they could probably strategize some kind of search party up in her office until they found it. Between the two of them they could canvas the whole area, leave no stone unturned. The Headmistress was busy, Lex couldn't wait for her to come down to talk this through so.....sticking a couple along the walls as said before.
Not many, just maybe five of them placed in such a way you couldn't miss them.--one stuck to one of the gargoyles too in case she conveniently didn't notice walls on her way up or down.
Ahem.
She scribbled her name on each at the end, so people who didn't already know her wand and candy bag would know who to contact. There. Her work here was done.