Haha... If you're worried, just wait until 12:15 when the regular receptionist goes to lunch and a student takes over, they don't know shit and hope anybody who looks like they know what they're doing will leave them to their book or whatever. Of course, different universities may have different methods of handling packages, the one I'm aware of just leaves them on a windowsill and has a sign-out sheet that they only check when something fucks up.
Different offices on the same campus usually have different policies, usually it's the prediliction of the receptionist.
Universities are great, it kinda reminds me of government, nobody wants to do any more work than they have to, or hear about anything that doesn't directly affect them.
Also, these places have the added benefit of completely ignoring all of those scary-looking stickers, all they ask is that you are prompt in picking it up :p
A little off topic, but, I've gotten things that were in flagrant violation of UPS, fedex, and postal shipping guidelines. Nothing interesting, believe it or not some people are actually photographers AND rocket hobbyists :p
Goddamned 5lbs of sodium nitrite in a CONVENIENCE STORE SHOPPING BAG. I am not making that up.