Understand, you have no desire to sell this cue, as you've repeated. We won't expect to see it up for sale. Ever. I think that's good, as you should keep it and enjoy it.
To answer the question, dozens of cuemakers make a piloted ivory, or composite joint, where the shaft insert and tenon enter the joint. When you said "fully," you were probably referring to a flat face joint, usually done with a larger joint pin, sometimes completely flat, sometimes with a countersink. The insert inside the joint, I've seen from the Tascarellas, and I've seen the top joint plate from Black Boar. The insert from the Tascarellas is stainless steel; yours is a bit harder to tell what the material is, as Doc said above.
The joint looks like ivory, though when it is the fine grain like this, I usually expect to see a change of the grain to the more blank space in the tusk, though there are some sections where the finer grain covers a good deal of space. Looks like you might have that. The ferrules are a bit harder to tell. Could be photography, but the color looks slightly darker, and it looks like it could be melamine, rather than ivory. But there's no way to be sure without seeing it in person, and checking out how the shaft tenon was done.
For something this unusual, I would think that Dan Janes would recognize it, but apparently, he didn't...
Hope this answers some of the questions.
All the best,
WW