I noted them all down on paper and then updated the digital map with all the box locations using Skitch. The blue circles on the map are original boxes and the red diamonds are the same boxes but with a France Telecom cover. Finally there were a few other boxes and I didn't know what exactly they were so I marked them with triangles. I may have missed a few boxes because I didn't want to go snooping in people's yards but I'll try to fill them in tomorrow.
Most of the boxes are really old and are made of concrete. I assume they were put in when the homes were initially built. Today an older resident told me the homes were first sold in 1971 so Zed's comment about the ducts belonging to the residence are probably correct. However, some of the boxes have fallen apart over time and they've been replaced with new France Telecom boxes. One of my friends in the neighborhood had France Telecom replace their box in the driveway this past year. I'll try and talk to him tomorrow to see how that worked and why France Telecom put in their own branded box.
I ran into a couple of residents while I was looking for the boxes and they all seem pretty excited about the prospect of better connections via fiber. I'm going to send off my application for the company (SARL) to my friend who is a lawyer tomorrow to have him look over before submitting the application next week. That will then allow me to contact the operators directly.