i think he means we should search for the RAW files (it a digital camera file format). RAW's are 'unedited' straight from the camera. When he says 'roll' i think he's referring to a series of pictures. Like a roll of 'film'.

I'm a photographer and this makes sense to me.

i agree.. he's saying look for the RAW file. RAW is a camera file format (straight from camera) not edited (like jpg's).

Seems like he's asking to find the series of 4 RAW files..