Body has approx 340k actuations, but keep in mind the z9 is a 120fps camera that doesn't have any moving parts. It's not "actuating" anything, its just the number of file writes to the card :)
There's some superficial wear to disclose - the "ok" text on the rear is partially worn off. The eyepiece has been replaced with a third party one that blocks the sun better, the original is $7 on amazon if you really want that design. Aside from those things, body looks good to me. The actual metal finish is mint, which is really unusual for a workhorse camera like this.
I have the RRS L-bracket which I'll toss in for another $170 (it's $270 new) and I have another battery available for $130 ($200 new).