How to fill out the customs form 7533 bringing mail across the border to usps

I'm filling out the form 7533 to bring some mail into the usa from canada to mail with usps but I'm not sure if I have filled it out correctly. Does anyone have a sample to view. There are only 12 spaces to fill in items but I have more than that so I would have to use another paper or can I just use a  printed excel document. Any help would be much appreciated.

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