I just drew 39 times from the Admin Building. There was only one encounter that I drew more than 3 times:
"Discuss the opportunity to sell a monograph with the President of the University. Pass a Lore (-1) check to make the sale and gain $5."
I drew it 6 times. It appears on 3 location cards out of the 39 that exist for the Admin Bldg. It's a little suspicious that I drew it 6 times instead of 3 times, but it's not very conclusive. I ran a chi-squared test on expected versus actual distribution and the results were not significant (i.e., the results were very likely to happen by chance).
Incidentally, if the encounter had appeared on only one location card, then drawing it 6 times would have produced a significant result for the chi-square. In other words, the encounters that are being drawn over and over tend to be the ones that you'd expect to see over and over, since they have multiple location cards.