[Icare9]

Can I ask for some help with these?
On 4th December 1943 Halifax HR732 was lost and no trace of aircraft or crew graves has been recorded, but as the pilots wedding ring was returned 3 years after the War ended, the relatives believe it was hit by flak and exploded hence no large identifiable wreckage.
On pages 94/5 for Jan to Dec 1943 a number of losses are recorded (I believe 25 bombers were lost or failed to attack) so I can eliminate some with known night fighter claims, hopefully leaving what might be HR732 crash site. The MACR references seem to be given in the far right column, but how does one progress from the MACR number to the Report itself?
There is a belief that the ring was sent back from America, which might be the case if a US team was involved.

Any hints would be appreciated. Thanks in advance