Paul,
I'm not an active FB user, but If you have a Facebook account, you may also want to consider their Marketplace. Earlier this year I sold off my D850, D500, 200-500 and some other lenses there fairly quickly and for pretty much asking price. I buy and sell quite a few items of different types and I find far less scammers and time wasters there as compared to Craigslist, though I'll typically list both places. I generally insist on a phone conversation before meeting anyone (really helps me get a read on people) and typically meet at a police precinct, bank or other mutually agreeable location to do the transaction.
As others have mentioned and you well know, selling directly can put a lot of money in your pocket, especially if you're not in a rush, but you have to be willing to put up with a modicum of inconvenience and dealing with "people". I've probably put close to $2K in my own pocket with the items I've sold vs giving that to a reseller because I was willing to do the work and assume a very small amount of risk.
YMMV!