Banksy's identity on eBay

Surely this is an intriguing and funny one at the same time. Someone is selling a piece of paper with Banksy’s real name on it. The author stated the following:

I have uncovered his identity by matching up the prices of his sold pieces to corresponding tax records. I will reveal no more details.

Has anyone got the name of this US based person who somehow has access to people’s private records? Is this even legal do disclose this? Oh well, let’s just wait and see what happens. If you would like to bid or simply have $25000 to throw away just go here for more details.