My orange weapon from the warrior went underground, I think. I spent an hour looking around the entire area for it. (He does always drop one the first time you kill him.) Soon afterwards, however, I received 3 legendaries and killed jimmy Jenkins one go through the preservation reserve. And they weren't crappy either, the Maggie, the bitch, and some sticky grenade that pulls people into an AoE damage area then explodes after a few seconds.