Guess I need a bigger hammer then...
Box came out of a 240 that was quite a mess, one rear quarter was early (no vent) but it had the toolboxes, gearshift hole had been cut forwards to accomodate this box so it wasn't original to the car, must have been raced at some point as all the lower arms were plated as were the engine mounts and there was a brace joining the rails together.
When I got it the roof had been removed and the chassis number cut out so the original identity is probably lost forever.
Roger