Giovanni sign posted in Lynn

LYNN – Police hope the giant photograph of Giovanni Gonzalez on a Wyoma Square billboard will prompt someone driving by it to remember any, even the smallest detail, that might help find the 5-year-old Lynn boy missing since Aug. 17.Clear Channel Outdoor-Boston installed the sign Thursday to help police sustain interest in the search.Clear Channel spokeswoman Rochelle Cowan said it is fairly rare for police to ask for the company’s help in an investigation. The company slapped the face of a man wanted in two rapes across a Route 9 billboard in 2003 to help police gather tips on his whereabouts.Giovanni’s mother, Daisy Colon, dropped him off at his father’s Lynn apartment on Aug. 15 and neighbors saw father and son the following day. Ernesto Gonzalez told police on Aug. 17 he had not seen the boy for a week.He pleaded innocent on Aug. 18 to a child endangerment charge and is due back in court next Wednesday.District Attorney Jonathan Blodgett this week said Gonzalez has declined several requests by police through his attorney to talk to them about his son’s whereabouts.Attorney Halim Moris declined to comment Thursday on Gonzalez’ upcoming court appearance.With the Gonzalez search in its fourth week, police refocused the investigation on a new round of interviews with people they want to speak with in connection to the disappearance. They want to know if anyone may have provided transportation on Aug. 17 to Gonzalez, who typically traveled by bicycle or bus.Police this week also redefined areas they want to search. The State Police search team, including trained dogs, is conducting the search with Lynn police.”This is different for them,” Blodgett said. “They typically do rural searches. This one involves an urban setting. We may also get an infrared helicopter flyover again.”The search to date has included two local cemeteries, Flax Pond and downtown yards, apartment buildings and an abandoned building on Johnson Street.Police are also reviewing videotape from bus and subway stations and asked Dumpster and trash hauling companies to check their refuse containers and transfer stations.”We’re not sparing any expense,” Blodgett said.