I'm thinking that anything that's ever held gas in it MUST be shipped with ground transport only.
Actually, after checking the Canada Post website I found this:
Quote:
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Canada Post will not otherwise accept packages that contain dangerous goods or that display dangerous goods symbols. Canada Post must assume that all markings and labels on a package identify the actual contents. If any evidence of former hazardous material contents is visible on the box, the parcel cannot be accepted.
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Direct link
HERE
Also, read everything under Section 6.
I believe the only way to properly ship these items is by being properly labelled, though courier ground transport ONLY.