My thought on selling the scope....
The MSRP is $70k.
Actual purchase price for typical customer is going to be less than that.
Typical customer is a rare instance - ask any Keysight sales person I am sure. I would guess (myself included) that if I needed and was looking to buy, I would be cautious/worried about buying from an individual. If the price was low enough, I could get over that but I would want a different probe package so I would only want the box itself and maybe 2 of the probes but only if it was giant discount.
If the plan is to put it on eBay or some other T&M broker - it could sit there for a long time or the price would have to be very low. After paying the taxes on it, waiting, and selling for a big discount - it seems that the profit would be rather modest relative to the work. Maybe worth it, but not really if it took many people to pull it off and they need to divide the loot somehow.
This is NOT at all like getting $70k cash free and clear. Not even in the ballpark of that as far as cash value goes.