If it were a bunch of lawn chairs cabled to a parking meter a day before the big parade - fine. I'll honor your request.

One lonely pack, packed-up and ready to go on the shoreline in the BW/Q? When you see me landing at the site you intended to claim w/ a pack like that, you better be there before I've assessed the site's suitability and finished unloading.

I've never considered leaving a pack as an option so my assessment would be someone forgot it. You may even need to describe everything inside perfectly once I've had time to invoke the full finder's keeper's rules of ownership. Asking nicely might get you your pack and anything in it I liked, back. I'm only half kidding.

All of your camp stuff ... set up? Totally different story although I'd wonder a bit if I noticed the site went unused/unchanged for more than a night or two depending on location and weather conditions.

There wasn't a poll radio option so I couldn't vote for ~Wouldn't do it nor honor it. As defined in reguard to reserving a site that way, Finder's/Keeper's would get my vote.