You wont find out if Compusa was a Muckup until you get a shipped email and then after that, it'll be 4-7 business days for you to receive it if you took the free shipping option.
I do believe is entirely possible that compusa actually DID have a few. Id say its a decent probability that they DID have a few. Someone actually HAD to put that listing on the website, but then again, they may have put it up thinking they were supposed to get a shipment today from PNY and then didnt receive it. I dunno, hard to tell. Keeps fingers crossed.