Mystery Charger Theater (subtitle: There's my missing part!)

[71 SE3834V]

It's cold out. I'm tired of the monotony of working on this house project everyday. Can't do anything with the car so I thought I'd post up this little mystery about my car.

One of the few missing parts on my car when I bought it in 2011 was the plastic part of spark plug retainer located on the passenger side exhaust manifold, lower front of the engine below the alternator. No big deal.
Flash forward:
So I'm putting my engine bay back together last fall after stripping & painting it. I'm laying under passenger side just behind the front tire hooking the vent line back up. I take a break, lay my head back and look up. What is that under the fender amongst the debri?

[71 SE3834V]

I reach up and whatta ya know! There's my missing retainer.
So how do you suppose that got there? The only thing I can figure out is it came off while someone was working on the car, they laid it up on the cowl and it got knocked down the opening between the fender and cowl.

[71 SE3834V]

Either that or it took one magic flight after coming off while driving and the fan blew it up on the cowl.
Any other ideas?

Post up your own mysteries. I'm bored.

[archie360]

Most likely left by D.B. Cooper to mark the location of his stash.  Maybe fell off and someone put it there temporarily while working under the car meaning to put it back on?