When you collect the 8 pieces of the comic strip from around the island, and assemble them in the frame for the Klassic Komix guy, the locker combination is written across the middle : nine three...
His locker is on the second floor of the school, and it is stuffed with junk. Once you get the comic pieces, you will see his locker combination (9305). Open it and then recover the School Blueprint...
Nate's locker is on the second floor of the school near the Science Room. It is obviously stuffed full of junk. The combination is on the comics that you assembled into a strip. Use the number (9305)...