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I'd imagine a printed and dated read-out from your axle shop emailed to a Keystone warranty rep would more than support your cause. Like mentioned ... new units go thru some rough handling by the delivery drivers once they leave the factory headed to a dealer. Sadly most any dealer doesn't have the equipment nor the trained personnel to check alignments ... so that relegates them to just parts changers. You could have perfectly good axles, but spring hangers not welded in the right place causing skewed alignment in relation to each other and the frame. You could have a busted spring pin that locates them on the spring perch that's welded to the axle ... all kinds of scenarios.
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