Raymond Chandler in DOUBLE INDEMNITY Cameo?

Fred MacMurray walks by Raymond Chandler (?) in Double Indemnity (top); Raymond Chandler lights his pipe (bottom)

In a June 5 piece for The Guardian, Film London Chief Executive Adrian Wootton discusses Raymond Chandler’s purported cameo appearance in Double Indemnity, which Chandler co-adapted with director Billy Wilder from James M. Cain’s novel:
"… More than 60 years after its release, a French cinema historian and two US crime-writers almost simultaneously happened on the same bizarre discovery – that Raymond Chandler, uncredited and previously unnoticed, has a tiny cameo in Double Indemnity. On 14 January, the American mystery writer Mark Coggins, tipped off by another writer, John Billheimer, posted the news on his website, Riordan’s desk, [...]