better don’t disclose it for privacy reasons. (at least for now)
You're worried about privacy now, but it sounds like you're acting like their brokers. It doesn’t really matter, anyway—everyone’s overwhelmed with the same patterns. They try to hit $300k a month, which is what GoDaddy pushes for. So, in a way, they end up going for low-hanging fruit and leave the stale stuff behind. I’ve had a similar experience with Afternic—once a broker asked for $1,500 for a domain from $1988. Guess what? The broker stopped calling me for about two weeks. When I checked the landing page, I saw that the broker had changed the price to $1,500. Had I not checked, it likely would’ve sold for that amount, even though it could have sold for $1,988 to a different buyer.
I was furious. So, instead of $1,988, I set the price to $19,888 as a "Buy It Now." Two months later, I got an email saying the domain had just sold. I checked, and sure enough, it sold for almost $20K, and I netted $16,400 at the time.
What I would do if I were you is tell them their ship has sailed, and list it with a "Buy It Now" price on the front page, with an escrow service. Cut the price a little to make them want it even more.