Basically, I have a holder of Bitcoin wanting to sell. They have roughly 392,000 BTC, and invested very early and held on to it.
Any advice or recommendations would be very much appreciated.
This doesn't seems believing that you have that kind of bitcoin and yet don't know how to sell it, if i may ask this then that how did you acquire such, if you buy through a particular means then why not go through same to sell your bitcoin, there are exchages, there are people trusted who perform an escrow service, incase you don't want to use an exchange, so it's up to you first, that what exactly is it that you want, are you trying to avoid the exchanges or make use of the escrow service providers if you are privacy minded.
Honestly, that's what I'm thinking too; he got to buy a lot of bitcoin, and yet he doesn't know how to sell it. It's weird that his question seems silly in my opinion too. It's very simple, and there are many ways to sell Bitcoin.
Google is there to provide guidelines on how to sell bitcoin. Then it also makes me think that 392 000 bitcoins is a huge amount; that is not a joke amount, and I don't know if this op is telling the truth on this topic he made. It was as unrealistic as it used to be for me, like it was just a made-up story to talk about.