Technology and nesting boxes

Morning everyone, Sorry for the block of text. As previously, no rich text options in MS Edge... We've volunteered to check a number of boxes as part of a reintroduction project. We've a little experience and, with care (and speed), can check with success, even when a box is occupied. Our worry is that if we were to check a box just prior to fledging, there might be a strong possibilities that young birds would simply leave (not our aim). I picked up a cheap endoscope for my Android smartphone, but can't get it working with any of the driver programs I've tried. Does anyone have experience of this type of kit? Big thanks - Dave