Like oldhand said, it may be IP code or TH code which both of them wouldn't have the PBSI logo, for sure you must ask to take off the hologram sticker and see the code under it.
Then don't buy it Why should you buy it if you're not sure it is genuine? It's the seller's responsibility to convince the buyer. This is not some rare artefact that can't be bought elsewhere. This is just an ordinary racquet available in any Yonex store. In any case, it's your money. No one else will shed a tear
The price is only attractive if you assume it's real. There are a number of experienced guys here telling you it's quite possibly fake.
If you're going to buy it make sure and ask him to remove the Sunrise sticker before you purchase but ultimately it look real only if it is SP then is is fake because the PBSI logo is missing and the SP logo on the shaft!!
Wan Don't Buy it!!! If he says hes not going to remove the sticker - its probably going to be more than likely that its fake. As Oldhand said there is a tiny chance of it being genuine. You pay for what you get.
Um, its legitimacy is just a matter of checking the cone code. Please see posts 19 and 24. The prospective buyer has already received plenty of good advice. It's tiresome to offer more advice when speculation is preferred