Doesn't look right to me, I think the locks' push bar should be the other side of the lever in the housing. However, if you turn the lock 180 degrees and install it in the boot lid the action of closing the lid should move the lever back as it hits the latch allowing you to turn the lock back to the push to open position.
Guy
ps. lock someone in the boot with an 8mm socket and a torch just in case. Or remove a light cluster so you can poke your arm in to undo it!