Just finished reading the text of the bill a bit before you published this and I started laughing/crying when I saw this:
"Monetary instruments with amount left blank.—For purposes of this section, a monetary instrument in bearer form that has the amount left blank, such that the amount could be filled in by the bearer, shall be considered to have a value of more than $10,000 if the instrument was drawn on an account that contained, or was intended to contain more than $10,000 at the time"
So, a blank check is automatically assumed to be worth at least $10,000. Leave your checkbook at home the next time you cross the border.