uhm,now why would someone in their right mind compress an image using jpg,thereby losing quality and img info,THEN save it with a lossless format like PNG ?? makes no sense really..in an image like that with alot of similar bit's of color info it would make more sense of keeping it an jpg and thereby saving space..making an png of it would keep the same size if not increase the file size due to the algorithm it uses to lossless compress the img
perhaps the camera was not high quality and saves jpg. maybe he doesn't know about images on computers..I could go on.
Lets try and not speculate if he's telling the truth or not. It's stupid..we do not have enough information either way to prove him wrong or right. For all we know he could have been trying to dump the image for us and the error is real.