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Thanks for the reply! It's the original BMW top box. For what it's worth, the brackets don't appear to have been tampered with, they look "factory". I'll keep looking.Is your top box original BMW or aftermarket? Because to me it looks like someone 'modified' the brackets in the photo with DIY rivet nuts or epoxied in nuts to secure the box. My brackets don't have those nuts.
There are small covers for those two spots.looks like I might be missing some parts

Thank you so much for this @Delray , I stared at this many times and somehow kept missing it until you pointed it out.There are small covers for those two spots.
Part # BMW 46 54 7 680 837, "Cover Plug."
URL for any and every BMW C 650 GT part: https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=57522&rnd=09082020
View attachment 5495
Very nice of you to say, thank you. Many wizened riders gave me help when I was discovering the wonders of maxi-scooters. I'm happy to pass it on.Also, just wanted to thank you for your many insightful posts here