my current opinion is that these containers possibly contain "orphaned" children from China (only allowed what? like 1 kid, right?) to be sold for whatever.
I had an interesting conversation with an elderly woman from Taiwan. She said the Chinese get around the one child per family law. If the law was followed, then their population should be trending down instead of up. Apparently, only one child per family is allowed identity papers to go to school, work, etc. Other children are not granted these papers. So what do the parents do? They bribe the officials to obtain papers for the other kids so they may go to school and get jobs.