Directly in place of the rear seat, there is a handle. Pull up on it. It's a "secret" storage area. The things directly to the sides of it are "glove" boxes, also of value, but not nearly as much.
If you can find a "trunk" cover, or cargo cover, those are also valuable, but harder to sell, unless you find someone that wants OEM parts in a non-ricer build.
But yeah, directly between the side pods, that thing is a mint.
Usually, you can get up to $100 for it. Some places, they sell for much less. If the one in either car is black or in mint-ish condition, you should be able to pick a price between $50 and $100.