I've run into the problem with putting things in Celia's locker. I've tried everything. Clicking the different items in inventory, clicking on the closed drawer, clicking inside the open one... doing it for the lube, the dildo, the sexy outfit, the vibrator (even other things I had in my backpack)... nothing happens.
I've already got the webcam software setup on my computer at home, I've already put the envelope in her locker/drawer after writing on it... it's gone now... so it would seem she got it... but nothing I do will let me put anything in the drawer. I've talked to her since then, waited days, etc...
EDIT: Nevermind. I went back home for another night and checked the computer and webcam software on it and she sent a friend request. Once I accepted that and talked to her, THEN I could place things in her locker.