Depending on where they live, a passport or a passport card can be obtained in as little as 24 hours, but it will cost a tad more for special handling.
I wouldn't risk becoming an accidental importer, it could come back on you big time.
There was a Canadian trying to sell a BigFoot
just last month that was already parked in the U.S.. The price seemed super (I called it Grand Theft Bigfoot) but it didn't sell very quickly, and still may not be sold, perhaps for the same reasons
Short Editorial Follows:
Considering how long passports and/or passport cards have been required for travel, I have little patience for those that haven't yet "bothered" to get one, especially if they live close to Canada. (Not wanting to travel into Mexico I can understand those in the south not being so concerned))
But, then again, maybe the buyer doesn't want to, or can't risk crossing the border for whatever reason(s). Seller beware!!!!!
Just to add to my last sentence. Border crossers have been apprehended and held for everything from outstanding federal warrants to being delinquent on child support payments, and that's not to mention the issue of being undocumented in the first place.