I can only speak of the NB8B. My SP, mind you...
The rear badges all have two holes drilled in them. I know this because when I enquired with a panel beater about debadging, he said "It's simple", then tried to pry one off with a ruler, then snapped it in half, then found two holes. Oh, and then had the temerity to try to charge me $700 to 'make it look better'.
I have subsequently filled two of the three badge areas, and I am in the process of fixing the third, which is the Mazda badge under the central tail light. The badge holes can be fixed relatively easily, I just screwed mine up a little, so I am repairing it properly.
So, here's what I learned:
1. The rear of the NB has holes for the badges;
2. You can fix it (I have been taking photos, and I will make a tutorial-type thingy when it is done); and
3. People have a tendency to dislike being called a mindless cretin in front of their employees; and
4. In a totally unrelated topic, I no longer go to a specific repairer in Newcastle, whom I will only identify by PM.
Oh and 5. You can learn a lot on this forum about repairs, and it is kind of satisfying, knowing that your repair will be better than some hack. I have a lot of gratitude to the folks on this forum.
Oh, and here's a link to get you started:
LinkyC.