D500 issue (1 Viewer)

[Oldnintheway]

Hi folks, My D7200 has all but bitten the dust. So a month ago I pulled the trigger on a brand new D500 from B&H. Right from the start I had great difficulty sliding open the memory card door, but figured it was just new & stiff. While out in the field one day I was struggling to open it and a small piece of rubber appeared in my hand. Very fortunate it didn't drop in the weeds below! I searched the camera for where this could have come from and discovered a tiny port/slot 1/8" x 1/2" or so just behind the card door. Adjacent to the N mark for the NFC antenna. It was a struggle getting the rubber piece back in the slot and I'm still not convinced that it's properly seated.
I got home and searched the manual, and all internet sources that I could find and there in NO mention of this feature! I contacted Nikon and they have instructed me to send it in for repair, but still have not told me what it is! I keep asking and they just keep telling me to send it in. I have contacted B&H and am awaiting a reply. I've decided that the camera needs to be replaced or repaired. I'll take the least difficult option after I hear from B&H. But I would still like to know what the hell this is?! Pic attached. Anyone?

 

[paddyluke]

have a look here to compare http://www.nikonuser.info/fotoforum/viewtopic.php?f=33&t=3063

 

[Oldnintheway]

Yes! Exactly my experience!! Thank you paddyluke, but I still don't know what the hell it is!
I have contacted B&H photo where I bought it. Fortunately it's right at the 30 day return window. They have issued a return label. But I will be without camera for 2 weeks or so. Nikon wanted me to send it in for repair and me pay the shipping! I have always bought 2nd hand and never had a problem. I splurged for a new one this time and.....