Hello, I formerly had an Instawallet and have the address and other details, dating back to 2011.
I tried sending a pm, but was told you weren't able to accept from me.
Please respond and let me know additional details regarding recovery.
Unfortunately people who ask for help here never come back to confirm or update us if they were helped. So right now, it's just guess work. Try your luck by contacting him through other alternative means.
Here are some more of his public contacts
boussac.75011@gmail.com
https://www.facebook.com/pierre.noizat
https://linkedin.com/in/pierrenoizat