Most of the Buy More staff believe that Big Mike actually caught the marlin himself, but in fact he bought it off of Ebay for $200, as he reveals to Morgan in "Chuck Versus the Marlin".
Norman plays an important role in that episode. Lizzy, the Fulcrum operative under the disguise of a delivery girl, hid a receiving bug inside of it, containing information that Chuck was the Intersect. Also in that episode, Jeff and Lester steal Norman,hide it at Chuck's home, where it's found by Morgan, and hidden it the freezer of the Orange Orange.
Team Bartowski find the bugs and are convinced that the bugs caught conversational that would inform Fulcrum that Chuck was the Intersect host that they has been looking for. The team figure out the Marlin is where the receiver was planted but find out that Norman had been stolen. It is revealed via CCTV that Jeff and Lester and stolen Norman whilst drunk. The team eventually track Norman to Chuck's Apartment and take it back to the Orange Orange where Lizzie later brakes Norman open and takes the receiver.
Norman is put back in Big Mike's office at the end of the episode but he has a visibly broken nose.