I'll see what's going on here
they show that they are activated which box are you getting only 1-13 on 68, 69, or 70 last 2 digits of your SN
I had a similar sitution. I obtained 3 DA, hooked them all up, but wifey turned one of the off by mistake while I was setting them up online. Thus, only 2 registered.
I went back to re-register the box a few weeks later, and it worked fine.
I think it just takes some patience and make sure that the boxes are turned on while you are setting them up online (you should be able to use the same registration code for all 3).
hope this helps.