If you do something like 'odmget CuDv | grep -p <device_name> | grep ddins' and look for the ddins name in /usr/lib/drivers, what do you get?

Sounds like the cfgmgr has failed to load the required devices in to the kernel. 

I would suggest first "rmdev -dl deviceX" to completely remove each affected devices,
then "cfgmgr" to rediscover and hopefully make them available.

If that fails, and no new devices are found, you should re-install the device drivers
"devices.whatever" filesets - use "smit cfgmgr" and the option to pick the right ones
off the install media.

If that still fails, I conclude the adapters in question may not be supported on that
version of AIX - perhaps you did an update rather than fresh install and have thus
retained defunct ODM entries with no matching drivers.

Or is this an LPAR to which the devices are genuinely no longer available ?

Let us know how you get on with this.