I'm also waiting to hear about the condition of the exterior of the box like the others. There would have had to be some obvious exterior damage which would have sent up a red flag when it arrived, especially to shear off the knob like that, I'm doubting this was a result of the carrier.
My guess the pictures you saw from the seller were older pictures prior to however he/she damaged the sub. Were you home when they delivered it, and if so, you could have checked the product before the UPS guy left, and refused it right there, but I guess that is water under the bridge right now.
