Hi Matt thank you for you great work. I have a ASUS BC-12D2HT myself so I checked the firmware (all three versions) for that model available on your site. It seems that they are also "DE".
Again, I have no idea if the stock was or was not DE. It's just that the byte at the same address is 0xDE instead of 0xFF. I also checked BW-16D1HT 3.02 (the other firmware base for OmniDrive) btw, and the one from your site has 0xFF at the same byte address and an MD5 of 97f0eeabd0b675b4363b2c4749226016 (as expected by OmniDrive).