GRAB IT - GRAB IT NOW!!!!
Sorry, that was just too exciting.
On a more serious note, you just aren't going to do any better. If the thing works and is not damaged/beat up (I know - unopened box), you need to get into the car, get over there immediately and pick iy up. This qualifies as "Grand Theft Subwoofer".
You may end up with subwoofer bragging rights here for some time to come!!
Also, assuming this is not a sub that was procured in a less than stellar manner, you may be able to talk HSU into providing a warranty. If this guy bought it and is selling rather than returning, they migh go for it. This way they don't need to deal with the return.
BTW - why is he getting rid of it?
