Hmm, interesting. I better add that part. I think a nice FAQ with continued updates, about postcard clues, would be fun. I did a little, and then never followed up on the zip+4 and direct dial.

The old street scenes just need a car buff or two to ID the 49 Buick or 55 Ford pick-up in the picture. You can usually get within a few years of the origin by finding the newest car in the picture.

The Casino promo cards almost always have the latest Caddy, Lincoln or some luxury car, that's planted with a model or two. But some street scenes from Freemont St. will have a jeep or old Willy's Overland, so it's harder.