I'm not sure if all places do, or are even capable of doing, a four wheel alignment. When I last got mine done this is what they checked for a four wheel alignment.
Front - Camber, Caster, Toe, Cross Camber, Cross Caster, and Total Toe
Rear - Camber, Toe, Cross Camber, Total Toe
Assuming this was a four wheel alignment done right, that's what an alignment shop should include when you go get a four wheel alignment. Not necessarily realign the rear, but at least check it to make sure it's in spec before aligning the front. From what I understand, to align the front wheel's properly the rear wheels need to be aligned first. Not entirely sure if this helps but that's my experience. This was done at a reputable performance shop. If I had my guess your dealer or a reputable service center should be able to align it properly and/or figure out why your tires are wearing so quickly on the insides.