Law enforcement officers say the thieves who stole Goya’s now-recovered “Children With a Cart” from a Howard Johnson motel parking lot likely weren’t looking for it. ” ‘This time of year, close to Christmas, they probably thought they’d found a truck filled with PlayStations and broke in and started looking for the biggest-looking box,’ said Steve Siegel, an F.B.I. agent who serves as the spokesman for the bureau’s Newark office.”