In the case I remember (see other comment), marked 2 days after it was actually picked up. I always put mail out at night, so next morning + 2. That was just

In the case I remember (see other comment), marked 2 days after it was actually picked up. I always put mail out at night, so next morning + 2. That was just one I happened to catch because it arrived late, for all I know it happens with every piece of mail.