I have a hen who started laying recently, about 2 and a half months early too, who refuses to use the nestboxes. She walks around the kitchen whining about not having a spot to lay eggs despite her seeing other hens lay eggs in the box and there being a dummy egg in it. Normally she eventually plops one down on the floor, but today she was being very stubborn about it which made me fear egg-bounding, so I brought her in the living room and made her a blanket cave on the couch where she nestled down and laid her egg.
She is very spoiled.
She is very spoiled.

I even put food in it to try and entice her and had no effect.
I said 4 months early by accident in the vid instead of 2 months early.