I saw them on the news. There doesn't seem to be a pattern of who these seeds have been mailed to. They are obviously from China by the envelope as anyone who has used Amazon for small beads, split-rings or other small items know.
The envelope appears to be small, about 4X6 inches or smaller. Inside are no markings or documentation, just a small plastic baggy a few inches on a side filled with seeds. All the seeds are identical but not all of the packages contained identical seeds. They were various colors, shapes and sizes.