Latch under glovebox/foot rest?

[Liquidfusion-S3]

I know there's plenty of threads about rattles so I won't go into that, however my car has some how developed a rattle from somewhere near the passenger side!

I was feeling around the trims and stuck my hand under some sort of hole/latch under the glovebox in the passenger footrest and now it's moving quite freely, not quite sure how to stick it back and no pics yet.

Anyone got any ideas what that is?
And while you're at it, any ideas of things I can quickly check for rattles without having to read the encylopedia of threads?

Not sure if it is 23 from this diagram.

 

[Liquidfusion-S3]

*mod delete thread please*

 

[The Challinor]

Rattle gone then?

 

[Liquidfusion-S3]

Rattle gone for now, I can checked seat belt latches, all loose cables wrapped with fabric tape

That loose thing at the bottom seated back into position somehow and not making any noises

 

[David83S3]

I might have a slight rattle/noise from that area ....not sure yet as it might just be something in the glovebox (altho im sure its empty) or maybe coins in the coin box. .... keeping a listen out for it. Cannot stand in cabin rattles!!!