Hey Joe, IM not a seller but a fellow buyer. my staves were all marked with a number too but I think the numbers on mine were for the seller to keep track of which staves went to the buyer if he was selling multiple staves. I peruse the 'bay staves frequency and have only ever seen one that was dry or seasoned, and the seller noted that in the description. It sold a lot higher than normal. If I had to guess it wasn't cut in 2011 unless he noted that at the time of the auction.
A sure way to find out would be to go to your Ebay account. Go to your purchase history and find the seller. Send him an email and ask him if he remembers when it was cut or what his numbers mean.
If it turns out to be a two year old, then you may have lucked out and found the rare seasoned stave!