When a package of "garments" flown into Los Angeles International Airport turned out to be a coffin containing opium, a customs and a drug agent were assigned to escort the load on the rest of its journey to St. Paul. Working as undercover delivery men, they left the coffin in Mark Sa Yang's front yard after Yang signed for it Sept. 3, the agents said in a federal indictment Wednesday. Then they settled in to watch. Yang went to a store to buy a two-wheel handcart, which he struggled to use in moving the coffin to the back yard, according...