I know the BMW literature says, "Deep Blue Metallic - 997," but when I picked up some touch-up paint back east last year, the "official" color was "Dark Blue - 991." I don't know what the discrepancy is, but it is a perfect match. Unfortunately for us here in California we are not allowed to buy touch-up paint. Apparently people eat it out here or something. I currently need some paint for my Harley and have to pick it up next time I am in Boston.
I also had my top case painted but the shop matched a damaged side case lid that was damaged in shipping. The bike looks great, much like Joe's in the photo.
Good luck finding the paint and post some photos once the top case is repainted.