around here you get a slip that must be on the post, now when I go in without a res, I ask for a list of reserved sites, or call the office on my cell and ask if a site is reserved when I am in front of it, and if it is not reserved or payed for at the time I am there and if open for the duration of my stay, I tell the park attendant that I am going to drop my trailer on it and come back to the office and to start the paperwork, I giver her/him all my info over the phone so now the site is mine, I drop the trailer and go back to get the slip and sign the visa slip
and god forbid there is a chair there as I may mistake it for a toilet, or if its a nice chair it may end up by my campfire.