Wow, can't imagine BdP going stale, since my fairly new bottle has such a vibrant smell. My advice: re-purchase and enjoy. It's great stuff - rich, complex, sillage, longevity. All very good. I put some on at 8 this morning. Still going strong at 8 this evening.
Creed Vetyver, on the other hand: my bottle smelled kind of old from the day I bought it, but I kept it anyway. My wife recently bought a new one for me - didn't know I already had it. Big, big difference. Tossing out the old one now. It's worthless by comparison.
And no, I'm too nice to sell the stale bottle on ebay. . .