brand new account with over 1,000,000 coins in total

that's awesome, where should we send you the money first sir ? :"D
Not me, my clients. We need buyers who are willing to sign a Confidentiality and Non-Circumvention agreement prior to revealing our sellers. I assure you though, this is very real.
Escrow will take place through a third party who will verify the Buyer's proof of funds and hold the Bitcoin.
Is it possible for your sellers to prove this by signing a message through few of their big wallets showing they actually have such huge amounts with them? If not, I highly doubt anyone would ever take interest to go for such offers. Should they be willing to sell, what rates are you people willing to sell it per Bitcoin (at least an average)? I've got bulk buyers who trade ~100-500 BTC daily, but as said, you need to meet the conditions I've publicly mentioned.
Yes, this can absolutely be arranged. We have a discussion over the phone, go over the terms of the Buy Sell agreement and ensure we have an understanding. My clients would be looking for a series of 500 BTC daily transactions, with an obligation of 20 or more days. There is a lot of coin to sell.
We have been discussing with other buyers a 7% discount.