Rear wheel part question

[Flying Passem]

First time to pull rear wheel for tire. After getting wheel free and clear I had a part I wasn't aware of hit the floor. Pretty sure it happened when I pulled the sensor plate from wheel....maybe. Heard it and then found a plastic piece that looks like and about the size of a valve stem plastic cover except it is smooth, no threads inside and a flat head. Does it fit into the hole located opposite of the hole where sensor goes thru when it's mounted?? Bike is a '16 non ES. I don't see that plastic piece on a parts fiche. Thanks

 

[holligl]

Picture? Don't recall any plastic.

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[Flying Passem]

Didn't get a pic today. That would help

 

[WJBertrand]

Is it chromed? Did you snap off the final drive vent cap by chance?


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[Flying Passem]

No it's a black plastic piece and the vent cap is fine. Beginning to think I picked it up riding and it lodged in the area of the caliper or rotor and was dislodged when I moved things around. I'll may get a pic and then hang it on the wall as a memento.