I spoke with a fellow who ran a local Shell station then. He says he remembers giving out the cars from a box on the island. He did not remember there being a display stand. He said there were promotional posters.

Looking for photos, etc from 60s era Shell-A-Rama gas station and Pal's Diner, Rt. 17 Mahwah, NJ
& US or state highway signs, shields, route markers