Messed up

Went camping at coast/county park and paid for 2 nights. Filled out envelope and deposited in iron ranger. Went to play golf and left doormat, trash can and firewood plus tag on post. Came back 4 hours later and someone had moved my doormat and set up 26 foot trailer with ever jack/wheel chock tongue leveling device known to mankind. My buddy laughed (he was camped next to me) and we started fire in my old fir ring. I moved my RV to his spot and soon the host shows up and says "1 rv per space". I say he took my spot and then she says well you marked your ticket on the box with 2 (days I paid for) instead of dates (which the iron ranger tag had). I said did you look on your list of who paid as the campground takes internet reserves also . She said I don't have that info and the other camper said I left nothing to mark my space. My fault but there were 15 other spots within 25-150 ft. So they(squatter) came back as we drank beer and talked till 10 with no apology. I said he could stay and I moved 15 ft to the next spot. We were leaving in the morning and talked to the real ranger and he agreed with me that the host should have at least looked at site instead of taking his word that there was nothing marking the spot. I learned a lesson use my reading glasses and leave more stuff. :)