Wow, it's a Euro model for sure and appears to have had the factory tow bar. That's something I've been wanting, but don't know if the rest of the parts are there? I was fortunate enough to find
some parts of a tow bar, and maybe it's enough for me to use as a starting point to fabricate one.
There was a plate mounted in the trunk floor.

This is what the underside of it looks like. This is what that large bar connects to.

There is a part that mounts at the rear (and I see the 6.9 has these holes as well):

I think the other part of that large bar used to go here:

And here on the other side at the hook:

I couldn't tell if this bracket was part of it:

There were plastic wire harness covers (which were broken, but I got them anyway--I think I can see them in your pictures through the taillight openings). I also got the nifty trailer light adapters that plug in between the taillights and taillight plugs.

If you can get that large bar and as many tow bar parts as you can find without putting yourself in danger, I may be interested, or at least someone on here should be because the two bar parts are really hard to find. There should also be the actual bar that goes from the large bar in the pictures to the passenger side of the car and would have the actual hitch on it. Maybe it's in the trunk? I'm curious about it. At some point I want to have a functional tow bar that doesn't just mount to the bumper.
I wish the dashboard was already out, because I'd have you cut out some sections of wire harness.