Does Rex have the command to search and sniff out weapons/ chems/ food like Dogmeat did in FO3? I've only had Rex as a companion once, over a year ago and I cannot for the life of me remember if he did or not.

My aim is for him to hopefully sniff out the Gobi Campaign Rifle in the Snipers Nest. Its in the very hard locked footlocker. I remember Dogmeat being able to grab weapons and ammo from locked containers and I'm hoping Rex can do the same...my lockpick skill is woefully low and will have to grind to get it to 100. I'm lvl 32.

Thanks.

Rex gives you the Search and Mark perk, which highlights food, chems, weapons, ammo and such (or containers they're in) when you zoom in your view. He won't be able to open containers to get those items, though. You're going to have to boost your Lockpicking to 100 one way or another to open that locker.