Need advice from Canadians selling parts

Well 7' long is why. Max.length thru Canada post is approx 3-4' (I cant remember exactly)
I fill out 1 shipping label(declared value on it, "used classic automotive part" as description) my address and receives address. Total time is 2 minutes.
Hope the trim made it in good shape?
7 foot long rocker and rear quarter trim.

Back to OPs question...

What do you do and what forms do you fill out?