Discussion of the covers in European philatelic publications alerted collectors in the United States. On March 11, 1972, Lester Winick, president of a group of collectors of space stamps and covers known as the Space Topics Study Group, sent a letter to NASA's general counsel asking a number of questions about the Sieger covers. The letter was forwarded for a response to Slayton, who casually mentioned it to Irwin in late March; Irwin told him to talk to Scott. Slayton spoke with Worden on the assumption that the covers referred to were among the group of 144, but Worden told him this was not necessarily the case and that he should talk to Scott. Slayton did talk to Scott in mid-April, just before the launch of Apollo 16. Scott told him there had been 400 covers not on the approved list, and that 100 had been given to a friend. In his autobiography, Slayton wrote that he confronted Scott and Worden about what he called a "regular goddamn scandal": "they told me what the deal was, and I got pretty goddamn angry. So I was through with Scott, Worden, and Irwin. After 16 splashed down, I kicked them off the backup crew for 17." One reason for Slayton's anger was that he had defended the astronauts as rumors of the high prices being paid for the covers circulated; according to Andrew Chaikin in his history of the Apollo program, Slayton "went out on a limb to defend his people". Slayton wrote to Winick, stating that the spacecraft had carried covers, but NASA could not confirm these particular envelopes had been taken; he did not tell Winick unauthorized covers had been flown. He sent a copy of his response to the general counsel's office at NASA Headquarters in Washington, which took no action. Slayton did not inform Administrator Fletcher, Deputy Administrator George M. Low or his own superior, Christopher C. Kraft of the postage stamp incident or of the disciplinary action he had taken.