Mystery item in boot

[AreWeThereYet]

Can anyone enlighten me what this item is in the boot of my Calais? It is normally hidden under the floor mat and is right at the forward end of the boot floor - that's the back of the fold down rear seat we are looking at. The red bit seems to be something like a plastic reflector which is slightly loose in its fitting (it rattles to the touch).

 

[Z31na]

I think this has popped up on JC before. Sensor to do with they keyless entry system. My Evoke that is old school key and remote has none of these sensors.

 

[Holden17]

Here you go…take your pick
https://forums.justcommodores.com.a...dentify-this-thing-fitted-in-the-boot.269155/

 

[Anthony121]

 

[AreWeThereYet]

Thanks all for enlightening me. I particularly enjoyed the laughs in the previous posts indicated by Holden17. There certainly are some comedians on this forum.