There are also several threads here outlining how to repair the crushed cabinet corners.
Another option is to watch for some parted-out ones locally, or at least close enough where you can go get them. Contact any seller that's listing the components. They may be planning on tossing the cabinets.
I'm really sorry that happened to you. Same deal here. I no longer trust that speakers, that's drivers OR systems, are gonna get here safely unless the sender REALLY packs them well.
I perceive that the carrier claims adjusters take considerable pleasure in writing "Denied - inadequate packaging" over and over again....