I wonder if anyone can use that code?
Nope, I tried it( didn't recieve the code) and it doesn't work. So you're out of luck for that. I wonder if the target emails are for members with high activity on the site or something similar.
Hm, I assumed they maybe just checked to see who was logged in on that day around the time the issues happened...? I don't use eBay that often - I just search for stuff for pricing references/possible deals.