I doubt it was personnel, Garth. People buy lists, all the time, and send out mass mailings.
I get stuff, like that, from time to time. My smart-mouthed wife refers to it as "More junk mail, from your fans." It's annoying, but it seldom means anything.
About all you can do is, notify the delivery service (UPS, Fed-X, USPS, whoever) and have them deal with it.
Good Luck
Mike K.