The so called "Cairo Gang" photo comes in fact in two varieties, one with the Getty Image Archives and is credited to a Sean Sexton, and another attributed to the Piaris Beaslai collection at NLI . Beaslai was a cousin of Lily Merin (or Mernin), one of Michael Collins' moles in Dublin Castle, who passed much useful information to Collins. He was also, worryingly from the point of view of spin, IRA Director of Publicity. It could have come from Reynolds who was supplying Collins with information for money. .
The collection of material held in Dublin, Military Archives (The Bureau of Military History) and contained in a scrapbook compiled by I.R.A.intelligence,1919-21,including intelligence in Collins papers. Labelled by the IRA as "Special Gang F Coy Auxiliaries" complete with names
F Coy ADRIC