He acquired an official internal Los Alamos staff telephone index. The name Lazar, Robert was listed there. "Presented with this evidence, Los Alamos were forced to concede that Lazar had indeed once worked there, but only on "non-sensitive projects." In August of 1990 Knapp uncovered Lazar's W-2 wage slip and tax statement for 1989 which showed payment (after deductions) for his spending five non-consecutive working days at 'S-4' claimed earlier by Lazar to be the facility housing the alien craft within the Papoose Dry Lake region of Area 51. Knapp discovered that the pay slip was genuine and issued by the United States Department of Naval Intelligence in Washington. He also received an acknowledgement from Nellis AFB, Las Vegas, Nevada that a facility known as 'S-4' does exist and "operates certain equipment" there, but they refused to elaborate on what exactly."