Yes you don't need to force the seat. Take off the lower squabs, which just pull out. I think the backrests are just on clips then, pull gently from the bottom IIRC. As Frank says, you then have to work your way round all the other bits that are revealed.
I hate the Coupe boot lock. With my last car my only door key broke. I had two copies made which worked the doors and petrol cap fine, but would never lock the boot. I could only do this with the broken key shaft in a mole wrench.
Last year I had a new boot lid fitted with the old lock mechanism. Ever since it will lock, albeit the barrel does not retract into the lid, as it should.Then you have to jiggle the key around for ten minutes to get it unlocked, stressing the plastic top of the key, so I just leave it open. I've taken off the lock and re fitted it all possible ways, but to no avail. A guy in Australia has had exactly the same problem but no-one has been able to suggest a solution.