Yeah, why new tires after 8k?? Careful on which tire you put on, some tires don't work well with certain cars. I know it sounds silly, but I've seen it especially on Mazda 3's. They put an aggressive performance tread on there, alignment specs are perfect (within spec) and suspension still good and they get feather edging.
Also no uncommon for a car to come off the line with out of spec wheel alignment. I will be putting mine on the rack soon to double check the alignment.
And I may be wrong, but in theory, if the insides of your tires have the wear, that usually indicates toe OUT.