Presidential pardons for...unidentified criminals?

A slightly, though not overly, unusual question…

In the United States, can the President grant a pardon to a criminal who hasn’t actually been caught or identified? (Say…for the sake of argument, “Dan Cooper” aka “D.B. Cooper”)

Wikipedia does say that someone doesn’t have to be convicted or even charged with a crime to be pardoned (like Nixon), but it doesn’t say if the person actually has to be identified.

I kind of get the feeling that you would need an I.D. for a pardon, but I thought I’d check, just to be sure.

Didn’t President Ford pardon all of the Viet Nam draft dodgers? That, or any other general amnesty, would meet your definition.

Haj

Sorta, but not exactly… it was an amnesty program, not a pardon per se.

according to this source: (warning - link is to a doc file)