It arrived from to the US a month late with the top of the envelope cleanly slit open and not taped back up. No signature required just dropped off in the mailbox. Does this imply it slipped under the radar or could something more serious be happening?
It could be anthrax. IT COULD.
Just sayin'.
But yeah, I'm going with one of the assorted mail machine manglings. They wouldn't have delivered in this fashion otherwise if there was something to worry about, and you're past the point of that doing any good anyway.
Clean house a bit if you want to cover all bases, but I'd feel golden personally.