Had Boehner wanted to uncover the truth he would have created the select committee immediately. He waited for two years. That is plenty of time for witnesses to determine what the right answers are, to destroy documents that might contradict them, to weave a believable tale.
I think Boehner was warned not to by the regime. I have some ideas on why but they don't really matter for this discussion.
So here we are two years later. A select committee will require members and a budget of 5-10 million dollars. If Boehner has this set up in January so witnesses may be deposed beginning in March or April then we might have a real investigation. If it takes until April to get this set up and if the budget is a million or two then we don't have a real investigation. It moves from a cover up to a slow roll to run out the clock.
The question is why has Boehner done this.