Flat Cargo Area 2004 Passat wagon

When we bought our wagon, the dealer only had a manual for the sedan. I need to move some boxes but don’t know how to flip the back seats so the entire cargo area is flat - not just the part near the door. Am I asking for the impossible? Thanks for any help.

The base of the back seat flips forward, and then the rear of the back seats flips down. I don’t think there is a catch on the base itself.