Present on the Porch

Ryan got home the other day and found an advent calendar on our front porch. Attached to it was a note that read, "We were just in the neighborhood. Happy Birthday!" That's it. No name...nothing! We have no idea who it is from or how long it has been there. We never use the front door, but assume it couldn't have been more than a couple of days because my birthday was Wednesday. I asked a few people, but no one will admit to it. I guess it's just another Goebel mystery. Kind of like Ryan's keys.