I thought that the fact that both features (hard drive size AND wireless capabilities) were "nerfed" in the crappier system was common knowledge. <scold>Why didn't you do a bit more research on what exactly made the cheaper console ... cheaper ... before ordering?</scold>
Meh, I'm one to talk. If it wasn't for my utter distaste for Sony this time around (meaning I'm not touching PS3 with a ten-foot pole until they fall a few more pegs, and get off their High Horse), and the fact that I wouldn't settle for anything but the "best" one, anyway ... I may have done something similar. Still, though, I thought that both reduced features were widely known.
You'll be able to return it, if all else fails. Just don't even open it. Call your online vendor, ask for a return call tag, and a refund. Unless you bought it off of eBay ... then, you may have to face the possibility of being stuck with a wired connection. I just don't know a lot about the hardware. :/
I'm sorry. I wish I could be of more help.