Farming terra when I finally saw it drop. Of course I couldn't pick it up. Dumb glitch I didn't know about it till now. I tried picking it up at so many different angles till I had to walk away. Tough night to say the least.
Ouch, sorry to hear that. That's one of the things I've been trying to farm him specifically for, but I've not seen that or -any- other skins/heads from him so far.
I think about the only thing I've managed to find off of Terra at this point other than a couple Slayer mods have been an E-tech or two, and the Teeth shotgun. Almost didn't pick up the gun because I didn't realize it was supposed to be blue, and only the name caught my eye.
Good luck to you though, hopefully you'll catch a break.