Isn't it too late by now?
Admittedly I am not too versed in the delegate selection for the Libertarian Convention.
I think this mystery is kind of by design. Lets those who run the party decide their party's nominee without having to worry about things like run of the mill voters getting in the way.
In other words, I find it hilarious when advocates of 3rd parties complain about party insiders having undue influence in primaries of major parties and yet can't explain things like this very thing when I ask them about their third party of choice. How are these delegates chosen? Just a big ol' shrug. Some might be with a party that actually has a contest to determine these things in their state, but then I just gotta mention one of the states that has delegates popping out of the aether and they get angry.
But all the same, I appreciate threads like this. Makes it easy to keep track of the nonsense.