The first-ever Wawa in Sussex County is opening Thursday morning, replacing the beloved Chatterbox Drive-in, a 1950s/60s-themed restaurant that closed nearly four years ago. Doors opened at 11:30 a.m. Wednesday for a 90-minute preview attended by about 60 local residents, including some who had never been inside a Wawa. Arrivals got to meet Wawa’s mascot, Wally Goose, and sample the convenience store chain’s popular soft pretzels, among other items, but will have to wait until Thursday to try a Sizzli, hoagie and the rest of the menu. Bill Ott, area manager for Wawa, offered a playful overview…