Move from Series 3 To Bolt?

I want to replace my Tivo Series 3 with Bolt 500GB and have questions.
I have the Series 3 connected via Comcast Cable Card and I have a plan that only includes local channels plus HBO.
Since I have great OTA coverage and the Bolt supports HBOGO, would I be better off returning the cable card and using OTA plus HBOGO instead? If not, can I just move the M cablecard from the Series 3 to the Bolt without calling Comcast or do I need a replacement cablecard?

Is there any way to transfer the...

Move from Series 3 To Bolt?

Move from Series 3 To Bolt?