I suggest that we make it so users must post a screenshot or link to proof of the image's creator allowing them to use their image(s) on the page they're used on instead of just on message walls. If and when the current Community Team leaves the wiki, the future team won't have to wonder whether or not a certain image is stolen or look through our walls for proof, as it'd be right there on the page. Please use the appropriate templates to vote. Voting ends in one week.
Comment - Comment @Shades: If the original image is deleted (I'm assuming after the BTFF user posts it because otherwise they wouldn't have the image) then the user should be able to know where they got it from before and know the artist so they could show a PM, otherwise it'd be theft.
The rest of your comment is irrelevant though. This suggestion has nothing to do with how you identify stolen art, it's about users giving evidence for where they got their evidence from. This would also benefit you too since you wouldn't have to go through that process and look in message walls or whatever.