Just checked with B&O - only the first 300 BV9's didn't have them. I do understand that you are reluctant to drill the holes, I took a couple of pictures but they didn't tell anything but the fact that I need remove some dust from the back of the telly 
You can ask your dealer for a quick guide: A "Drilling and mounting instruction" (3543481), which will guide you through the drilling of new holes and how to mount the STB Cover on the back of BeoVision 9-50. It comes with four screws (4 x 2013081), for safe mounting of the STB Cover. They have supplied these free of charge to owners of the first 300 sets.
Roger