My experience differs from yours but here's what I experienced. I came to Canada from US as a visitor for a couple of months then received my PR in the mail. I left Canada and returned to "land" (at an airport). I filled out my content listing document pretty generically as I was not bringing them into Canada with me when I landed. Mine items were listed like: Clothes $100, pictures and housewares $100 etc. As it has been a few years, I cannot recall the details of the form (did it ask for quantity or number of boxes). The customs officer looked at it, I think stamped it, and then I could use that document as "proof" to bring my personal belonging back over the border later. Which I did but no one asked for the form. So in summary, I did not say 5 pencils, 2 post it note pads etc - I would have just said paper and office supplies $10 (or whatever you have).