Yes.
You can either go online and order new boxes or call customer service.
You will probably pay a few more dolalrs depending on how many boxes you have.
But you get more services.
Up to 6 tuners for viewing/recording.
1TB of storage space
Ability to pause and rewind live shows from all STBs.
Netflix (have to have your own account)
Ability to watch recorded content outside your house via FIOS app
And of course alexa