Hi Brett, if you just recently re entered the USA from Mexico (this was your last entry into the USA if Im reading the story correctly) then you should have dated stamps in your passports supporting this.
If they insist you go to Buffalo, id just ride back to the Mexico border and talk the customs guys there, explain the situation and see if they will stamp your bikes in. If they wont, then go back to Mexico and re enter the USA if possible, then continue with the shipping that you already seem to have in place.
What a kerfuffle! - hope it all works out
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