LAST EDITED ON Feb-20-18 AT 09:51AM (MST)[p]OOOPS, slow fingers!
Its fairly easy, I would think. Know how many PP's you have, then look in the draw odds report released by the Dept. If you did not have enough points to be awarded a PP tag in the top group, then it was probably (definitely) a random tag.
If you were in the top and there were more applicants than tags in the top group, I don't know that there is any way of knowing for sure.