I haven't been able to find clean rips of the Command Block sprites, and I want to rip them myself now. I believe that these blocks are located in the BObj folder, which simply contains three .dats.
I've tried using SPICA and Ohana3DS, because I know that they're actually .bch files, but both of them give me errors.
I've tried working on this even more. I still have no leads; I found a BCH2PNG program that gives me errors whenever I run it, identical to SPICA and Ohana3DS. I'm wondering if there's a problem with the files now.
The file starts with an 11 byte, so I thought it could be LZ11 compressed, but I tried and it isn't.