The phone number for Les Pêcheurs seen on the back of the photo Steve finds (81-42-67) differs from the one Manouche gave in Revenge: Post-dated (1974) (and indeed the one seen in location sequences, which was that of the premises: 89-59-61).
There's an obvious typo in the "Nice-Matin" headline "Successfull Charity Gala for Flood Relief".
Close inspection shows that the newspaper article headed "Naganda Art Collection Stolen" is actually about ASLEF, the UK's trade union for train drivers.
The prop "Nice-Matin" edition headlining the art theft is dated Wednesday 21st March 1973, and is identical to the copy that was seen in Revenge: Post-dated (1974).