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Nobody was more surprised that the Securities and Exchange Commission did not discover Bernard L. Madoff’s enormous Ponzi scheme years ago than Mr. Madoff himself.

After all, it would have been pretty simple, he said in a transcript of a jailhouse interview that is part of a trove of official exhibits released on Friday by the S.E.C.’s inspector general, H. David Kotz.

In the interview, Mr. Madoff said that the young investigators who pestered him over incidentals like e-mail messages should have just checked basics like his account with Wall Street’s central clearinghouse and his dealings with the firms that were supposedly handling his trades.

“If you’re looking at a Ponzi scheme, it’s the first thing you do,” he said.