There is still a chance (if the eggs are fertile), but not if the eggs are not incubated. It is possible that they both abandoned the eggs because they are not fertile. There could be a few different reasons why they chose not to lay their eggs in the nestbox. There might be something they do not like about the box - too small - too large - too dark - not dark enough - wrong location - somethng disturbed them while in the box, etc. Budgies can and do raise clutches on the floor of their cages, although this is not the best place for you to then try to keep clean.