Something fell off my D800!

Well, I was removing a SD card from my D800 when all of a sudden this small rubber piece fell out. It measures about 3/4" inch long:

After scratching my head for about 30 minutes trying to figure out where it could have possibly come from, I discovered it came from the back of the memory card door hinge area here:

Nice quality, Nikon!
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"I've been in more laps than a napkin" - Mae West