I just got mine today. (YAY!!!!) I live in Colorado. The envelope is stamped with the State of Colorado Department of Public Health and Environment. Below their address, it has "HSV-MMP - 8608 CONFIDENTIAL" on it. I don't know how different it looks from the CDPHE's other mailings. I'm willing to bet that the mail carriers who have delivered a few of these can tell what they are.

Grace