If you're really concerned read my post and watermark your scans. That is the only way to protect yourself on the internet.
I get it. If your door is unlocked and someone comes in and messes with your stuff - you have some responsibility to bear.
But it's still a scumbag move.
If you don't think so, I hope you never have someone damage things you've done or things you own.
And though yes, I "only scanned pieces of paper". The pieces of paper are things I've spent years searching for, and put tremendous effort into uncovering. While there are similarities to Wacky Packages, there are also differences. What I'm scanning and creating an archive of, these are unique pieces. No one else has a "full set" of them. Not the companies, not another candy collector - no one.
It was far from easy to acquire and curate them. But yes, the very last step I did was something your child could do. Sure.
And after dealing with scumbags and seeing what they'd done many times, I did block access to the full-size images, as I already said. And after that, I had the production of Mad Men calling me up, because they recognized that while it was just a scan and it was just some information, they weren't going to get it anywhere else but from me.
[Edit: I should add, however, that even Mad Men initially had a prop person contact me under the guise of wanting to "create a vintage-looking gift" for a birthday present. I IMDB'd the person contacting me and wrote a pretty firm e-mail back, explaining that it was profoundly unprofessional to do so. I got a response back from the head of the department, apologizing and explaining that their assistants are not normally allowed to say what show they work on. Okay...] These days, I get an inquiry about a scan "for a gift" several times a year, but I no longer provide them.