How could you ever prove the tires were changed at the dealer ? it would be impossible, and even if they were the selling dealer is sure not going to admit to it...the tires may have been sitting in the bottom of the pile at the warehouse and somebody spotted them and thru them in the truck that went to the plant...you sure can't expect crossroads to look at serial numbers on tires, they buy a load and install them, alot of people have had their hands on that load of tires before you or crossroads got them and to blame anybody without and proof is a really bad choice....in reality if crossroads decides to replace them they will do it to make you happy, they do not nor have they ever warranted any tires, the manufacture of the tires does not even warrant them, the wholesaler who sold the tires to crossroads does the warranty work and then the manufactuer rebates the wholesaler...good luck