The CIA has videotapes, after all, of interrogations in a secret overseas prison of admitted 9/11 suspected plotter Ramzi Binalshibh.

Discovered in a box under a desk at the CIA, the tapes could reveal how foreign governments aided the United States in holding and interrogating suspects.

And they could complicate U.S. efforts to prosecute Binalshibh, who has been described as one of the “key plot facilitators” in the Sept. 11, 2001, attacks.

Apparently the tapes do not show harsh treatment — unlike videos the agency destroyed of the questioning of other suspected terrorists.

The two videotapes and one audiotape depict Binalshibh’s interrogation sessions in 2002 at a Moroccan-run facility the CIA used near Rabat, several current and former U.S. officials said.

If the tapes surfaced at Binalshibh’s trial, they could highlight Morocco’s role in a counterterrorism program known as Greystone, which authorized the CIA to hold terrorists in secret prisons and shuttle them to other countries.

The American Civil Liberties Union has asked the government to provide more information about the tapes as part of a long-running lawsuit involving the treatment of detainees.

More significantly to the 38-year-old terror suspect’s defense, the tapes also could provide evidence of Binalshibh’s mental state within the first months of his capture.