No, I can't. I think that, in practice, the three categories are hopelessly interwoven. You should be able to "reduce" any event into any of the three categories.
Take the thing about the wallet. I can focus on the choice I made, and say it was my choice that mattered; I could have chosen differently, and but for my choice, the wallet would not have been returned. I can focus on the randomness, and say it was the randomness that mattered; I happened to win a small prize on a scratch-off lottery earlier that day, and but for that randomness, the wallet would not have been returned. I can focus on the casuation, and say that it was the prior conditions that mattered; a perfect computer could have known that I had brain-state X immediately before returning the wallet; and brain-state X is sufficient to induce wallet returns.
Well, why did I have brain-state X? It could be because I had brain-state Y a moment ago, which is a sufficient cause of X, or it could be because the electrons in some of my neurons randomly happened to be in the right place at the right time, or it could be because I chose to look down at the ground and see what was there.
And so on -- any given event can be explained in any of three different ways; when it comes to anything as complex as the human brain, the pure types exist only in our imaginations.
I assume that there is some line you would draw, be it at individual neurons, or cellular structures, or molecules, or individual atoms, beyond which you would say, "these types of things don't make choices." If so, how would you reply to the question: in what sense can a system built out of components that don't make choices be said to make choices?
A monthly thread for posting rationality-related quotes you've seen recently (or had stored in your quotesfile for ages).
ETA: It would seem that rationality quotes are no longer desired. After several days this thread stands voted into the negatives. Wolud whoever chose to to downvote this below 0 would care to express their disapproval of the regular quotes tradition more explicitly? Or perhaps they may like to browse around for some alternative posts that they could downvote instead of this one? Or, since we're in the business of quotation, they could "come on if they think they're hard enough!"