I had the same thing when I bought the car! mine are still in the door pocket. I thought they looked like something off the seat-belts but couldn't see anything missing. I'll have to keep an eye on this thread!
If you find the secret doors there are two switches,one corrects all the faults automatically on the suspension. The other prevents electrical problems from happening
Well, I had a look and blow me if the plastic stubbs weren't still jammed in the parcel shelf. Pulled them out and then drilled 4mm holes where they used to be on the plastic thingy. Couple of machine screws and nuts later and they were reattached. Bit of a waste of time to be honest but at least they are back in place.
they're supposed to stop the folding bit folding the wrong way, I'd guess if you found them after a valet then someoones just folded it with force the wrong way and they popped off