Les OSINTables
In this challenge, we need to find the address of Causette in the image:
We can notice that there is the number 83 in roman number VXXXIII (V=50, X=10, I=1 => 50+3x10+3x1=83). There is also the name of the street Rue Victor Hugo.
We can see on the envelope the beginning of the name of the city VE. At first I start looking at all Rue Victo Hugo listed here, but no city beginning with Ve had a Rue Victo Hugo. I then tried to type 83 Rue Victor Hugo Ve in Google Maps. I found 83 Rue Victor Hugo, Vergèze and flagged with: 404CTF{83_rue_victor_hugo_vergèze}