There's no serial number, and I compared the fonts to the real thing and it just looks a little off. I had a bad gut feeling when I received them, but wasn't able to compare them to the real thing until yesterday. I've posted in the Valentino shoe authentication thread just to get a second opinion. The seller claimed they were authentic but now is saying they were selling them "for a friend".
I've sent them an email, but their CS is terrible (which is why I prefer to buy/sell mostly on Ebay, but there are better deals to be found on PM) and they sometimes either take a long time to respond to emails or never respond at all.
I'm willing to send them in, and I'm still waiting on their reply. I buy and sell on PM fairly frequently, and usually catch counterfeits. This was just a busy week for me and there wasn't anything I could strongly point to that was fake.
Thank you! I've posted on that thread