Apparently they are having trouble loading them into the guide.
Hopefully, they can get them up soon.
Some might be able to get them though.
Here's how you can do a trick on your remote.
1) Go to a non Start Over/look Back channel. I use channel 14 and no I never actually watch it.
2) Press Down the OK/Select button and hold it down until you see a dot flashing above your box timer.
3) Then immediately hit the right arrow next to the button and punch in the channel number (!400 HBO HD OD and 1420 Cinemax HD OD)
I have looked at the HBO HD OD and it's almost identical to the SD version.
The only difference is anything uploaded before they put up the test channel is not there but anything new added to the SD version since then is on the HD version.
They also have the SD stuff on the HD channel but there is not a lot of SD stuff and it's listed as upconverted to HD.
Hopefully, they will have it up soon.