How frequently do Skittles packs contain an identical payload?

Once in 468 packs, found Eric Farmer.
So, on 12 January of this year, I started buying boxes of packs of Skittles. This past week, “only” 82 days, 13 boxes, 468 packs, and 27,740 individual Skittles later, I found the following identical 2.17-ounce packs:
Many excellent graphs in the report. I'm shocked and appalled by the distribution of total number of skittles per pack: there's a fair chance you'll get anywhere between 55 and 65 (though in fairness there's about a 2 in 3 chance of getting 59,60 or 61)