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Chip,
The indententation lines you saw on the tires are probably nothing to worry about. This is something that happens when the different plys are applied to the tire in a criss cross ( for lack of a better term ) pattern. Some tire mfgrs. do a much better job of laying the plys on, and molding the rubber than others, which makes them less visible, but if you really look close when the light is just right, you can still see the lines. Usually, the higher the quality, the less visible the lines are.
Glenn has been in this business a lot longer than I have, and will probably be along with more information later.
If Keystone replaced the tires, there may have been a problem. I'm sure they will inspect them and if any problems are found, they will return them to the mfgr. for adjustment.
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