Agreed that's a much better analogy. In this case the "retailer" already maintains such records. The government isn't even asking for the list of all purchases by all individuals, just the name of who purchased a particular item.

Sure in the course of getting the answer to that question the retailer may sift through the records of all purchases, but this is data they already have.

This is hardly something to be outraged about. Title implies something much different.