Well, I can only speak for my own area, but whenever tack is stolen, they just keep an eye out at local pawn shops. Generally, your best bet at getting back a recovered saddle after it's been stolen is to keep a record of the makers mark on it, the numbers that are stamped on it, and any marks/scars that it might have. Of course, pictures are a whole lot better, but if you can tell the cops that it's this brand, this style, with this serial number stamped here, and a scratch 3 inches long on the right side of the skirt, then the odds that you'll get it back are pretty good.
We don't even microchip our horses around here because sale barns don't scan and cops don't have scanners. Pictures, brands, and paperwork are how we positively identify stuff.