Buying a car without keys

So it was suggested to me with my fastback that with the rear seat down you can get to the rear plywood panel that separates the trunk from the car, fold that down and then reach in and open the trunk at the latch.
Any suggestion on how to go about folding down that separating panel from the car interior side?
How is it latched?
Post 33, there should be a spring loaded latch mechanism. On my 75 Dart Sport there were 2. I'm not sure if you will have much room to get anything in there or not but might be worth a try.