Just walked out of the vault with 37 gold bars, and ready to go back and had a few questions before I do so. I picked up all skill books except explosives because its a pain to get and I picked up the snow globe, I have at least one if every item from the DLC for my collection. I picked up all upgrades except the mod for the bear claw, going back and finding it looks like a pain. I didn't pick up every caravan card, two short and I didn't pick up all of Deans stash and might be missing a few challenges, not sure how to view all the challenges either. I picked up both ending trophies. Since I can't go back is there anything I could be missing? I havent gone back to the casino to check up on Christine or Dog or the other guy to see if I am missing additional dialogue after killing Elijah. Can I buy the final upgrade for the bear claw when I return to New Vegas without picking up the holo diagram, any other things to di, already got banned from gambling. Can't think of anytime else. That place was a pain in the butt to navigate through. Quite interesting story though. Holo Rifle is pretty kick butt as well with all upgrades.