Pair of pants and a backup shirt in the cabinet.
Stick deodorant, toothbrush/paste/floss in desk
Couple cans of Progresso soups, couple pouches of tuna + condiment packs (mayo, salsa, relish) to make tuna salad. Sometimes a row of saltines, sometimes a pack of pita as a tuna delivery system.
Large coffee cup for soup. Small coffee cup for bev's. Teabags, home-ground coffee and an insulated French Press.
Desk fan for cooling and accelerating clothes drying.
1 patch kit, 2 CO2 carts, a folding set of metric Allen wrenches, small bottle of chain lube.
They'll need to warn me the day before they fire me, because I'll need to drive in to carry all that crap home.