For a set of cards that are all hand cut to begin with, I would have cut up that sheet myself the day it arrived. Bada-bing, bada-boom. Set complete. My OCD would drive me nuts having it sitting separately in a sheet while all the other cards are sitting in the binder. The term "trimmed" holds zero weight, in my eyes, for a card that was intended to be just that.
Go find yourself a pair of scissors!
...here come the hobby police...