LOS ANGELES -- Two stolen hand-carved religious artifacts, sandstone lintels dating back to the 9th and 10th centuries, were returned to the Thai government on Tuesday in a ceremony more than 50 years overdue.The 1,500-pound (680-kilogram) antiquities had been stolen and exported from Thailand — a violation of Thai law — roughly a half-century ago, authorities said, and donated to the city of San Francisco.