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You can look up Audioshark.com, I see a few fpb 700cx for sale from ca 6 to 8k usd. You should be able to get at good price for it. I sold a fpb 600 some years ago and it was not difficult to sell for a good price (same with other krell amps i've owned). So maybe I would try 8k usd, even if maybe you dont get more than 6-7.
HiFi shark is also a good resource. There has never been a better time to sell gear. I just traded a CJ preamp toward a new component, I got all the money for it, $1500.... in less than 24 hours it was resold for $1750.
High quality gear shouldn't be tough to sell with 6 month and longer lead times that most mfg are experiencing.
Sorry for your loss, good luck with sale.