My Vista Ultimate counterfeit?

[Gonso]

Bought a 64-bit Vista Ultimate DVD on ebay, came with a product key. I asked the seller several questions about it, and long story short he insisted that he was selling a legit 64-bit Vista Ultimate (from the retail kit) with a legit product code. The retail version of Ultimate comes with 1 disc each for the 32-bit and 64-bit versions, but only one license.

It arrived, and certainly the disc is not counterfiet, but I'm worried that the product key may be. I've gone the micrsoft's site to see what the key looks like, and they do look the same.

However, I was hoping someone could tell me a little more about the little yellow prodcut key. Can you feel the security strip running through the middle (I can't)? Is it glossy at all - mine is flat with out any finish.

You can save the "why buy on ebay lol sucker", I knew there's some risk. In this case, the guy who sold it lives 20 minutes from where I'll be staying next weekend though. I just want to make sure this isn't a valid serial before I return it to the guy.