I'm having trouble finding the rear back lights fuse box lights do not work

I don't get whether you mean the Reverse Lights or the Tail/T-Sig/Stop Lamps, but either way, your fuse box is the UBEC (Underhood Bussed Electrical Center). It will be on the left front fender under the hood. Just use a test light hooked to ground and check all the light fuses with the key on, engine off. If they all test good, then you may have another issue. Please post your results (and which lights you are asking about exactly) here if you need further help. There is no fuse block under the driver seat.

check for fuse box under driver seat,

IF you have the owners manual, check in the back of the book for the index. Look up fuses to find the fuse location and function.

poss bad back up light switch?

It might be the junction block, their is a circuit board in it. It's on the frame behind the bumper.