The wooden Olmsted Historic District sign that disappeared last month on the day of Hurricane Sandy has been found and returned to the town. Town planner Peter Kane put out a notice to the local news media asking for information about the sign’s whereabouts after it disappeared, and a teenager reported finding it in the woods shortly afterward. The wood frame that held it between two posts was damaged but the sign itself is in good shape, said Kane, who added that after minor repairs it should be up again before the end of the month. The sign stands near Paradise and Walker roads and is one of two that identifies the early subdivision designed in 1888 by famed landscape architect Frederick Law Olmsted, who also designed Boston’s “Emerald Necklace” and Central Park in New York City.