Thats a bummer brock, hate to hear it. That said, its a simple mistake but East Harbor is one of the better laid out/marked state parks in my opinion.
As giles said above and i mentioned to the guys trying to figure out best sites at Paint Creek, the site is always to the left of the pad (looking at it), or to the right of the spot (if standing on pad, looking at the road). The box is the line for the neighbor to the left. All campers main doors are on the passenger side. Only within the last 5-10yrs have they added floorplans with a rear or driver side door for easier access.