It's worth what someone will pay for it when you put it up for sale. It's a crank-forward bike, not technically not a recumbent, and since it is 14 years old probably should have a new set of tires for the safety of the new owner (at his cost). Even though it is brand new and little used it is long out-of-production and comes with no warranty. It might be hard to find any OEM replacement parts if they break. You are competing with two-wheeled recumbents that aren't the hottest part of the recumbent market right now.
I looked to see what people are asking for this bike here: https://www.americanlisted.com/all_s.../giant+revive/ I think a lot of the people listing this bike are dreamers. It reminds me of my old BikeE AT. Heavy, inefficient, and not suitable for someone who wishes to ride a decent distance. Mine got replaced by a better recumbent after a few months. Surprisingly there are people actually looking for one of these as evidenced by someone who posted this on Bentridereonline in February - "Looking for a Giant Revive in the Albuquerque area."