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SA or Tech is confused and they likely can not convert from mA to Amps. From the C-Max Service Manual: "NOTE: No factory-equipped vehicle should have more than a 50 mA (0.050 amp) draw. Check for current drains on the battery in excess of 50 mA (0.050 amp) with all the electrical accessories off and the vehicle at rest for at least 40 minutes. Current drains can be tested with the following procedure." I believe a typical draw should be around 30 mA on average after all modules go to sleep. If ones SOC is low from normal battery aging, ones Ah rating might be only 10 Ah. Even at 10 Ah capacity, a 30 mA drain gives 333 hours until 0% SOC (around 10.5 V being defined as 0% SOC) and we know C-Max will start at 0% SOC. Again based on your voltage readings and the discharge curve above, I believe your draw was at least 360 mA. My guess is the SA meant they observed a 500 mA and in not knowing how to convert to Amps said 1/5000 A drain and in reading his literature on typical drain of around 30 mA was converted to 1/3000 A. How did you wire the after market backup camera in? The backup camera is only energized when the accessory relay contact closes and +12V via F31 in the Rear Junction Box (behind left side panel on rear wall powers the back up camera. So, when car is off, there is no power to the backup camera. My guess either the accessory relay is bad or Tech pulled wrong fuse. Camera should not drain battery when car is off.