Yes - one per box but the set was 360 cards so the odds end up being huge for finding that one player you're after.
I looked at the PSA pop report and there's 47 Garnett graded and Jordan has a few different cards in the set - some are 40 or 60 graded total and one is 100.
Shaq has one that is a pop 4. So overall - seems like extremely rare as people would have graded them by now during the covid boom grading era when we had that backlog.