G-Benz: Tray is dry. Thanks though. Of course had it some from there I would have been really pissed at myself. Being originally German and, yes, from Stuttgart!, I expect nothing but quality work from myself!
Kestas: I think you've got it. I went back out and checked everything, started the car, etc. Found no traces of leaks or anything.
We have alternating weather here right now, and it was a very nice and warm day following some chillier ones.
There is a spot where the gas could enter the trunk - at the seal for the filler. Even just a small splash would have caused a big stink, so to say.