Which port of entry did you enter Canada at?Hey Mistral, what border and time/day did you cross?
I'm guessing the crossing I chose connected to the NYS Thruway, the Rouse Point crossing is a major one so that's why everyone on line had to take a "random" COVID test. I mean they have a permanent tent there for testing. Also, I crossed on a Monday mid afternoon, maybe that had something to do with it.
I've had border agents ask me similiar questions. It's not so much about the rules regarding cash, they are just trying to trip you up. You are allowed 10k.
Rouses Point is not the port of entry (POE) the I-87 (Adirondack Northway) takes you to. Rouses Point connects NY-11 to Route 223 in Quebec and is also where Amtrak passengers undergo inspections.
I-87 meets up with A15 at St. Bernard de Lacolle. This is the main PoE with NEXUS lanes (NEXUS lanes closed due to pandemic).
In between these two ports of entry is another which connects NY-276 and Route 221.
221 and 223 are smaller POEs so I’m speculating no on-site testing but you may get questioned why you detoured out of the way (adds 30 minutes travel time to get back to A15) as only locals use these two ports. I was asked that question many summers ago (before being enrolled in NEXUS) and the reply was there an hour backup at St. Bernard de Lacolle as per CBSA border wait time site.