A3 - How Do I Remove the Trim on Underside of Rear Hatch Door?

There's something rattling around inside the trim attached to the rear hatch door of my A3. I think two screws have rattled out as there are two holes without screws if I look inside the bulb housings.

I've undone two torx screws on the outside of the trim and I've taken off the access panels for the rear lights.

There's also a little flap that pulls out, it's got a symbol of the car with the boot (trunk) open on it, can't work out what this is for.

I've pulled the trim down and freed two clips which are just inside the light hatches, but that's as far as I can get, the trim remains stuck.

Any ideas how to get further? Obviously my next step would be to use brute force, but I just want to check first!