I agree with what has already been said.
There are hidden auctions all the time in just about every collectible. Maybe it's just the cynic in me but when someone feels the need to mention an operation or some other hardship in an auction I feel suspicious or at the very least a bit turned off. I know if I had to sell out my collections for whatever reason, I wouldn't be advertising it to the world.
The only time I will help sellers out in a hidden auction is when the price is ridiculous high and they think their junk is worth 10 times it's true value. I send them a nice message and also suggest they relist it in the right category.
Sometimes if someone has something listed as a certain brand name and it is a knockoff, I'll tell them if I can tell it is a sincere mistake or sometimes I will let someone know a little more about what they have if they have it in the right category and any collector is going to find it anyway, just so they can add it to the listing if they want.
But, I've plucked a few hidden auctions myself and to me they are more fun than finding something in the clear and open.
"The farther we go, the more the ultimate explanation recedes from us, and all we have left is faith."