I will say one other thing to clarify:
Every night at 7 pm, I set two small shallow bowls out with just enough Oxbow Bunny Basic T pellets to cover the bottoms. They come galloping, eat what they please, which may be one bowl's worth! and then they'll run back to the bedroom, or hang out in the living room until I leave to go my 3rd shift job. When I come home in the morning, both bowls are almost always picked clean. Sometimes, though, for whatever reason, and I think the fireworks was the reason this time, they don't finish the other bowl. It used to worry me a bit, but this only occurs about once a month or so.
So... On that note, I must say they didn't finish last night's bowls, either, which is a tad unusual, but they're eating hay normally, though characteristically pickily, and pooping up a storm as always, so I'm not worried.
I think you just have to watch all the other behaviors and be careful, but not finishing the pellets isn't really too much of a concern, as long as your bunnies are acting normally otherwise. Now, if they consistently start turning their cute little noses up at those pellets, then I'd first open a new bag, and then if they persist, I'd take them to the vet to make sure they are healthy.
