Last time I was in the area, the stretch of Ont #17 between Rainy River and Fort Frances seemed to have more stores selling Cuban cigars than the rest of Canada combined, so I guess there is a lot of contraband going across the border.

Can't imagine it would give much satisfaction to the US customs officers even if they found anything though - it's probably like Wally said: you were just the 20th vehicle, or whatever their quota number is.

Given the number of customs agents and the facilities they seem to have in relation to the size of the border crossing, I would guess some congressman managed to get some homeland security pork (the part that didn't go to Wyoming), spent it here, and now they have to justify it.