2006 access cab?

About a month ago i began to hear a slight tapping sound towards the rear of the cab.
So crawled under the truck and could not find a thing loose anywhere,Then on a whim I looked in between the cab and bed and found it.
There is what looks like a 3"X4" plastic push in type of a cap that has come out and sitting loose on the rear of the cab?
Anybody have this happen and more important how to push it back in my hands won't reach and it is to tight (no room)..

 

Man don't tell me this is new and I am the only one?

 

Nothing like that on my 06 access cab... How many miles you have on yours ? Any off road bumps that could have caused that to come loose?

 

Pic? No idea what you're talking about.

 

i removed mine and haven't had any issues