He said 412 CVX designed the box. 412 CVX is pretty good about designing to specs of the woofer. Unless OP altered specs or asked for bigger box? I firmly believe it should be within range.
I would take your comment with a grain of salt. Wasn't he the same one that had the 4th order that did the EXACT same thing as this sub minus the crease in the cone? I'm pretty damn sure it was him. But we will go by your comment that hes pretty good about designing to specs.. I'll take that just as much as i would take a sealed box with 45's in the corner..