IOS 6.1.4 Screenshot file type?

Hi,
This is a question I've been struggling to find an answer to online.  Its based on some forensic work I'm doing with an iPhone 5 ( Model: A1429)
I have some IMG_####.PNG files within the Camera Roll that I have no idea how they got onto the phone (no messages, transfers etc) so I'm making the assumption they are screenshots.  However, myself, friends and a test phone are all running IOS 7 and when we do screenshots, they are saved as .JPG.  So I'm having trouble replicating this to prove this is a screenshot.
I can't find any change logs to show me changes from IOS 6 to 7 and if screenshots were saved as PNG or JPGS in version 6.1.4. 
This is why I am here, asking the community and or any Apple employee's / developers that may hopefully be able to either answer this or point me into the right direction please.
I've tried to downgrade an iPhone 4 to IOS 6.1.3 as thats the closest I could get, but its harder than it sounds!
Any help much appreciated.
Thanks.
DG.

Using a Metadata Extracting App, I can verify Screenshots are saved as PNG.   FYI, I use the Photo Investigator App.
https://itunes.apple.com/us/app/photo-investigator-view-remove/id571574618?mt=8
Sending the image by email to myself, I can also confirm it arrives as a PNG in all cases.
Not sure how you are sending it, but yes Screenshots are PNGs
The only difference I can note, is if I attach the image from within the mail App its file name on arrival is image.png.
If I send it from the Photos App, the file name is photo.PNG for some reason.
All tests were performed on an iPhone 5. iOS 7.1.1

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