For it to be "confiscation," the taking has to be permanent or for a substantial period of time. In this case, they are duplicating your property and returning it to you. Since you have not been deprived of its use, what's the harm done?

Sovereigns have a vested interest in knowing everything -- including data which passes over their borders. You have almost no expectation of privacy at the border.

Administrative searches are allowable under the Constitution. If they're allowed to almost completely disassemble your car at the border without probable cause, they can do this.

Constitutionally, you really don't have much of a leg to stand on.

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