I believe that those three aircraft were 41-2440, 41-2632 and 41-2658. Fast forward to July 13, 1943 and two of those old B-17s were still around, part of an eight-plane night bombing mission from Guadalcanal led by Lieutenant Colonel Rigley in 41-2632 Crock O'Crap, with Captain William Shotwell in 41-2440 Calamity Jane.

Gene Salecker's book has an interesting tale about how 41-2440 got her nickname. According to a 394th mechanic, Phil Klingensmith, when the three B-17Es reached Fiji they shared the airstrip with Navy planes from the carrier Saratoga. One evening three Navy planes were taking off and dust stirred up by the leading aircraft caused the two following planes to go off the runway and into two parked B-17s. One of them was 41-2440. A repair team from the Hawaiian Air Depot was flown in and 41-2440 was repaired using parts from the other, more seriously damaged, aircraft. That was late November 1942, and the repaired plane was given the name Calamity Jane.
Both 41-2440 and 41-2632 survived the war to return to the United States. There's no record of what happened to 41-2658, but it seems to me that she must have been the aircraft that was damaged on Fiji and then cannibalised to repair 41-2440.