Small and well packaged, not suspicious box : will usually not be inspected.
If it's inspected, you will have to pay import duties:
for any imported item with declared value of more than 20$ :
tax (GST ou HST) + canada post fees of 9,95
under 20$ : no fees
Ref : http://www.cbsa-asfc.gc.ca/import/postal-postale/duty-droits-eng.html