If I bring into the USA, 10 one-ounce Canadian Maple Leaf gold coins (which have a face value of $50 CAD), do I need to declare it as being over $10,000?

Face value is $500 CAD (about $476 USD today), but based on the price of gold they'd be about $11,000 USD.

The US Customs site doesn't have any info on this. As far as I know they are legal tender in Canada and like the American $20 gold Eagle, can be used as just $50 in Canada if one is crazy enough to spend it as such.

Anyone?