Please don't think this is a flippant answer, but if you cannot set up the ID's as independent, then I would strongly suggest that you not build new models from the data, but rather spend your available time and money on collecting usable data.
However, if that really can't be done, then some sort of hierarchical modeling might be attempted, regarding the multiple IDs per unique customer. If the unique identifier can be found, then you might consider the multiple measures as a repeated measure on the individual. From there, it gets considerably murkier, as model selection procedures in the mixed model realm are not easily defined. You will have to depend on subject knowledge more than you may want.
Steve Denham
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