Advertisements You can even write down the TSNs from the sealed boxes, and put them on priority update lists. I tried that, just to see what would happen. TSN was accepted, on a never-opened TiVo, still at the store. I like the TSN on the outside, as I'm the type that digs through the stacks, looking for the highest serial numbers, for anything I buy. Higher S/N on name model of product, tends to mean newer, and sometime makes warranty issues easier.