So, I shouldn't be concerned unless I see something alarming.
Well, after gently wiping one day, this is what I saw on the toilet paper...
Alarming, right? It's a metal staple. There was no blood accompanying it, but it was still disconcerting when a staple literally falls out of your body like that after a major surgery. It's very small and I didn't feel it come out or anything. I still called my surgeons nurse practitioner and she assured me it is common to see mucus, small amounts of blood, small amounts of stool, and staples when the stapling gun may have over-fired, essentially, if there was overlap on the stapling job and the top staple wasn't securely fastened into the bodily tissue.
Lesson learned: there's nothing wrong with shitting a staple or two.