Great question — answering as the UphillTech team:
Yes, usually it is not problem to get your passport stamped at a U.S. VAC, if you are willing to assume the risk of transborder courier services (not that it is necessarily higher than sending your passport across Canada). You may need to arrange the courier services to return the passport back to Canada, and your money order or bank draft for the fee payment needs to be in USD. Getting a super visa counterfoil does not mean a person in Canada automatically has their current stay in Canada extended. They must leave Canada and then be admitted on a super visa counterfoil to stay for up to five years in Canada.
Full answer by xngtng: https://travel.stackexchange.com/a/183505 (CC BY-SA 4.0).
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