I have not, but I can say that, from the Canada-U.S. treaty perspective, they are not public. Neither Canada nor the U.S. publicizes the decisions. I believe, under U.S. law, once they've had a certain number of decisions, they're required under U.S. law to say what the statistics are.
I think the reason that countries have not made these public is to ensure that the process works effectively. In a sense, it's baseball-style arbitration, with each side coming in with one particular number and then the arbitrator chooses between one or the other. That's the process that Canada has followed.
I believe that style of arbitration works best if it's not public. What you want is for each side to come in with what they think is the realistic right answer and not, if it's for public consumption, be thinking about what impact that position might have on other taxpayers in other circumstances. Then they might be less willing to compromise and come to a result in that particular case.