A bit of a detour from the Canadian warehouse topic, but I wanted to share this so Canadians (and anyone else) can avoid some hassle...
One of the vendors here — my go-to Chinese supplier — has an explicit policy of no reship and no refund for Canada, because the seizure rate is so high. I'm fairly sure the buyer never noticed this or bothered to ask, and placed the order regardless. When his package got seized, he naturally made sure everyone "knew" the vendor had scammed him. I sympathized with him, but he refused to accept that his money was lost because of a no reship/refund policy he had completely ignored.
So my advice: before you send payment, ask what the reship/refund policy is. Even if you've bought from them before, at least check whether it has changed.
...and if they switch your order from a local warehouse to shipping out of China, ask about the policy and think about getting a refund.