User Activity

I've got an interesting situation I'm dealing with right now. The buyer, with zero feedback, has a verified Canadian PayPal account and paid with an eCheck. The eCheck has taken 10 days to clear (it hasn't cleared yet, but probably will any day now)....
Long story....I'm not sure if a guy is trying to scam me, but let's put that question to the side for a minute....has anybody here ever called Canada Post and had them successfully stop a shipment from being delivered? I sent an item out Expedited Pa...