Read MoreFederal authorities are on alert for suspicious foreign packages containing seeds, sent to dozens of Americans across the country. People in several states have claimed to receive unexpected deliveries from China containing the various unmarked seeds. The USDA has now put out a warning urging those who have received the packages not to open them.Federal authorities are on alert for suspicious foreign packages containing seeds, sent to dozens of Americans across the country. People in several states have claimed to receive unexpected deliveries from China containing the various unmarked seeds. The USDA has now put out a warning urging those who have received the packages not to open them.