While disguised as a package-runner, go to the Crown Chemical Company's stockpile outside the gates of Stormwind, then return the package they toss you to Inspector Snip Snagglebolt in Stormwind.
Steal perfume package from Crown Chemical Co. outside Stormwind
I knew they were up to no good! There's some sort of mind-affecting chemical in here, but I can't get a handle on it with such a small sample. I need the real stuff.
Don't just go over there and buy it! I don't want you giving these scumbags one copper. Nah, you gotta get it from the source, discreet-like.
I'll disguise you as a package runner. I saw a stockpile guarded by their goons outside the gates. Go run by, and DON'T stop, or they'll make you! They'll toss you a crate. Bring it back here.