Thanks for posting the photo! It didn't occur to me to look for one.
I usually test the housing before putting in the camera. On my last trip, I brought along a Hero 2 with housing and a Canon G12 with a brand new Canon-made housing. I already have an existing Sony NEX-5 with housing that's worked for me, but I wanted to switch to the G12 because it has a single button white balance, operational zoom, and macro. The Canon-made housing leaked on the first dive. I cleaned it and tested it again the next day and the same thing happened. I ended up using the Hero 2 as my main camera. Now, I'm in a situation where the Hero 5 and housing are new (thus untested) and I would like to use the G12 housing, to see if the fix I did worked. I'm trying to keep the number of cameras and housing down to just two and not bring the NEX-5 and housing. I just needed to verify the Hero 5 housing is as it should be!