So I was at Wal Mart today and they were sold out of the reloading kit I want but they had a die I needed. It was a RCBS die part number 11401 for a 243 winchester.

Anyway, when I opened it the case only has 2 pieces in it and 3 slots that would hold pieces. Is one piece missing or is this only a 2 piece die set? Online pictures are only showing 2 pieces but I haven't found one that says. Thanks.

3rd slot is used for carbide pistol sets, or maybe a neck sizing die. 2 is all you get for a FL set.

A full length sizer and a bullet seater.

Those RCBS boxes are made generic with 3 slots in them.
They are sized to hold three dies (usually for pistols) but a rifle FL die set usually is only two dies as said by the others.