It appears the terms have been consolidated. HSI refers to DSL accounts. FiOS refers to fiber connections. Notice the 1-year service term for HSI, no such restriction for FiOS, although it is "as instructed by Verizon". You may or may not be asked for the equipment back. Rev.I, yes, Rev.C, no, or so I'd imagine.
9.3 Return of Equipment upon Termination.
If your HSI Service is terminated for any reason prior to the end of the first year of service and you received Equipment from Verizon, you must return the Equipment to Verizon or you will be charged for the Equipment. If your FiOS Internet service is terminated for any reason and you received Equipment, you must return the Equipment to Verizon within 30 days, as instructed by Verizon, or you will be charged for the Equipment. Failure to return any Equipment you received from Verizon, or returning Equipment in a damaged condition (subject only to reasonable wear and tear), will result in the imposition of an Equipment fee that may be substantial.