the 24-200 did have a tendency to have a higher-than-normal copy variation so I would check any lens out carefully for sharpness issues when you buy it, and I would honestly buy the 24-200 new, and not used, for this reason.
One exception to the "don't buy used" is "buy directly from Nikon refurbished." I believe they QC each lens that goes through refurbished sale. I bought my own copy refurbished and my copy is quite good. My 24-120 is still sharper, but I have to pixel peep, even at 200 mm, to tell the difference.
We'd hope they do. They probably do for lenses, but I've heard some rather disappointing stories from people about camera bodies they received, some of which look like they weren't even cleaned from the previous users/owner.
Lenses I'd be more concerned with though that they check them out, especially if they are returns (as some probably are), because you can drop a lens and it may not show any signs of physical damage on the outside but could misalign something on the inside. Camera bodies may show signs of damage more in some cases, but the lens thing is one reason I don't buy used lenses or refurbished for that matter, unless it's cheap like a few hundred dollars perhaps. I consider it to be "what am I willing to lose?"
Nikon has a 90 day warranty on refurbished. If they send you a lens that's not good, you have time to test it and can send it back for a replacement. I haven't had any issues yet (except my 40 f/2 arrived missing a lens cap, but they sent that quickly after I told them about it). I've bought 3 refurbished Z lenses and one TC. I'm not NPS, just a regular hobbyist.
Reputable camera shops will also offer a decent (30 days or more) return period for used lenses. I've bought two used lenses from my local camera store without any issue, because I knew I had time to test and return if needed, but those were cheaper lenses (under $300 each). Also, being a local camera shop, I could attach them to a camera and try them in-store before I bought them.
I'm not inclined to buy second-hand online except as factory-refurbished. There's too much stolen or, as you pointed out, dropped or damaged gear out there to be worth the small potential savings.