Is that the permit slip from the US border if your not a Canadian resident or something. Before we crossed the border with the wife, nobody asked or told us that we needed a valid I94 for her. Finally one time later, they looked at her passport and said she needed the slip even if we are Nexus members. So now every 6 months when we cross we need to get her a new slip. You can add the i94 to the Nexus file. Now even if we add the I94 info to her Nexus file, the US border guard always ask for her passport.
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http://www.cbp.gov/travel/internatio...4-instructions