It should be attached (if there is one) to the copy that is served. The failure to attach it probably will not effect the outcome of any suppression motion. The motion would be decided on whether sufficient probable cause was presented to the magistrate to permit the issuance of a search warrant (or some other issue unrelated to the failure to attach the affidavit).
It is supposed to be attached but often is not. It is not, as my colleague observed, a fatal flaw.
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