Typically, you only find out how you did in the mini bos by being one of the top three entries of the category. But making it to mini bos put you in the top few! (Depending on the size of the category entries, it could be as few as 4 to 6 or as many as 8 to 9 - I have rarely seen it greater than that, but I suppose it could happen.) I wouldn't worry about the numbers - focus on the things mentioned and hope that the judges who scored your entry did a thorough job of evaluation. If they did, you should be able to pick out the things that were well received and what might be the shortcomings in your beer.
As an IPA, I imagine that it was up against some pretty steep competition, so your beer must have been pretty solid to advance to mini bos. Congrats on that for a first-time entry!