Some of the HBO and Cinemax channels don't work right with the Channels I Get function, so they may still show up if that is the guide you are using.
The only way you will know if you are really still getting them or not is to try to tune to the channel and see if you get the channel not purchased pop-up.
The only way you will know if you are really still getting them or not is to try to tune to the channel and see if you get the channel not purchased pop-up.