Let us conceal things under floor tiles

[SL the Pyro]

Ursula is right on the money, this is one of the many devious secrets of the floor closet. In fact, this is why the floor closet exists; it'd be incredibly ridiculous if every player could hide shit wherever they wanted just by using a crowbar. Keep it limited to traitors, it's only one telecrystal for God's sake!

Maybe medium. Tank transfers and large right?

Tank transfer valves are bulky items, one step above large - the biggest, in fact. It was done to make hiding the bombs harder.