[mollynation]

Im not too sure a bout the first number 4?

They're simply stating that the serial sticker Is required to proceed with your claim. Destroying the Item without It, will not be accepted. In your case, It's not relevant, so disregard It.

In terms of the Image they're requesting, you can keep sending corrupted files using any of the online services below:
https://corrupt-a-file.net/
https://pinetools.com/corrupt-a-file
http://www.corruptmyfile.com/

Alternatively, have someone Photoshop the contents of the Image as per their request.

Ill try and corrupt the files and see what happening. Ill keep you updated