There's a lot of stuff in the antiquities tent, much of it quite useful. It's a good idea to take everything you can from here before you venture into the tomb, though it's not required; you can always come back for it when you discover you need it.
On the right table, you'll find the shattered pieces of a green amulet --
-- and a box, a pile of amulets, a list of the amulets (you don't need to memorize this list, by the way), all next to the world's ugliest tie.
On the shelves at the end of the room, look for a red binder to find one map of the tomb.
On the left table, you'll find a rechargeable flashlight (which you should take) and a pair of gloves (which I desperately wanted to take, but you can't) --
-- a map that you should take, and which Nancy will update for you as you discover new places --
-- and at the far right, a plaque with a bird on it (which you should take), a book on "Ancient Egyptian Art" (labeled "Relic" in your inventory), a crumpled flyer for an organization called S.P.I.E.D. (you can't take it, but you should take a picture of it), and a cracked clay tile with hieroglyphics on it (which you can translate if you want).