Yeah, I've wondered why Ticketmaster don't even put the name "Ticketmaster" on the envelopes (Unless there's a problem with the mail in people stealing tickets).
Still, there has to be some way as I thought the same thing - "Some stupid junk mail" - then I quickly ripped the top open and was surprised to see them.
I wouldn't want the envelopes labeled TICKETMASTER either. That's a freebie for thieves. Got mine yesterday, and I called Lars and left him a voice message saying "WEEEEE'VE GOOOOT TICKEEEEETSaah!!!"