You got incredibly lucky! It would be unlikely that you would be detained for questioning when entering Canada and almost unheard of that you would be denied entry, but it is almost a given these days that you would be held for lengthy questioning when re-entering the US without proper ID.
[political rant] Don't get me started on Homeland Security and those Kiddy Kops at the US port of entry. Crossing the border several times a week, I have seen so much that just makes me shake my head and clench my teeth...and try to smile politely [/political rant]
Yeah, it's no joke these days! Inmywoods and I didn't have our BCs...just our DLs. WE got into Canada without too much trouble....the border lady gave us some hell, but let us through.
On way back though, it was a no-nonsense type border guy with shades. He asked questions regarding stuff bought and seemed to not to believe me at first. He kept looking at back of the jeep and appeared to be about to ask for a search and re-asked the question. I replied and he let that hang for a couple minutes and let us through. I hate border crossings!
Thanks to you HC, there was a quick micro for us to take a break and relax on the ohter side.
p.s. Yes, we are getting our Passports and BCs to be safe for the next Vancouver or Victoria cache run.