Elsa and Gilbert have both decided to try pellets! It took eight days for Gilbert to take a second glance, but then he tried one. And then a few. And then Elsa followed his lead. Finally, they're trusting that I'm not trying to poison them!
Hopefully! So far, I've only offered celery leaves floated in their drinking water. Instead, they do everything in their power to not touch the leaves. I'll try to find something else budgie-friendly to offer them tomorrow.
Thankfully Elsa and Gilbert don't do it too often. Thought Elsa has taken to randomly laying in the seed dish, since it's the only one really big enough for her to lay in. She has laid in the pellet dish, but she has a difficult time getting out of it, since it has a seed guard.