1) New player should not be using a ARC-z. You are asking for trouble. 2) I hope you did not pay more than $10, or get your money back. 3) Don't buy racquet on ebay when the racquet loaction is in china.
I think this racket is fake. Because with the date 21 Nov 2009 the serial number must start at 8xxxxxx not 7. You should double check with this racket.
Go to the thread that you can post your info to find if its fake. Where did you get it from and how much, the serial looks quite low. Also the Z Slash is a big racket for a beginner, its tempting to go for but a hard racket to handle.