> knowingly

Did he know he was suspected of something? Was he suspected of something?

It's more about knowing the PIN would wipe the device, and providing it with that intent.

Edit: 18 U.S.C. § 1519 doesn't seem to cover this (unless it covers the act of setting up the duress PIN in the first place as "altering"). § 2232(a) covers actually knowingly providing the duress PIN.