Sorry to hear of the mishap. On the plus side, it's lucky it didn't fall on the driver side (the front panel) so perhaps the drivers survived intact. The cabinet crack (the seam) is likely cosmetic damage. I doubt that it goes right through the enclosure, which is very solid.
Call Joe Vassallo, our service manager, toll-free at 1-866-294-6688, during normal business hours, and ask him about ordering replacement inserts that accept the grille (and a new grille). Perhaps you can repair the cosmetic damage to the corner of the cabinet or have it repaired at minimal cost.
If the drivers and crossover components are okay, you might be able to order a new enclosure and grille. Joe will tell you how to install the drivers.
Axiom Resident Expert