screws missing on bottom of canon elph 135

I have a Canon Elph 135 for 18 months. Recently noticed that the two tiny screws at the bottom of camera are missing. (Near the selfie stick/ tripod hole)

I had an older canon that this happened to and eventually the housing falls apart.

Canon says they don't have parts for this model as it is a replacement model. Costs $45 to send in and get a replacement. Anyone knows where I can get replacement screws and what size do I need?