Boomer's Box Letterbox

*** Box is in place as of 10-1-12 *** Our cat Boomer (RIP) likes to wander. Sometimes he travels great distances. We know he was planning a trip to the Black Hills in South Dakota soon. 

We received this cryptic postcard in the mail from Boomer this weekend. We're not exactly sure where he is, but if we can figure out his location there's a good chance we can find him. He's very predictable. Once you have figured out Boomer's location, insert it into this web address (all one word, no caps): http://bit.ly/___________.