Question about the cargo area

[sweet100s]

Saw a couple more CR-V's this weekend. 8)

In the plastic near where the where the cargo-area walls meet the glass, there's an indentation about a foot in on both left and right sides.

It looks like it has an access door for something.

What is this for?

[NLPayne]

To install a pull-type cover over the shelf for security.

[sweet100s]

Thanks NLPayne!