Please HELP - Rolex Daytona RSC triplock crown

[JacksonRain]

@padi56 @Tools @SearChart

Hi gentlemen and TRF, so I was unscrewing the crown for my timepiece that has recently gotten back to me from RSC. When I was unscrewing it, and not looking down, I noticed something that fell from my watch or from my hand. The crown was screwed on extremely tight when it came from RSC, although I'm not sure if that is relevant. When I unscrewed it I noticed what appeared to be a circle rubber piece. I didn't think much of it, but then later when I researched the triplock crown and gaskets, I came across would appears to be a Rolex part which appears to have fallen off when I unscrewed the timepiece.

I attached photos.

Is this indeed a part of the triplock crown or gasket?

Based on my review of pictures, if it is a Rolex part, the only way to see if it popped out and the triplock crown is actually missing something is to take out the case back and remove the stem.

Thanks to you guys and everyone in advance.

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