Keep current or former tires on my new truck?

[ticopowell]

Yeah i know how many miles my tires have on them because i still have the receipt, the others have a warranty pamphlet in the glove box but it doesn't say anything about when they were put on ... the seem to be in pretty good shape, and i think i will go to the place where i bought my tires and see what they think about the new ones since they sold me the old ones and know about them.