Well woke up at 6am, and the chick was already gone

My very first hatch ever didn't hatch til D25.. everyone that hatched (9 out of 12 that went into lockdown /shipped eggs) Every chick thst hatched was perfect..but I also think that late hatch was due to low temps in my incu..
IF the eggs are hatching late bc they are old eggs, then I would probably only help if they were rare or expensive eggs bc those do tend to have more issues..but I've had deformities in chicks hatched over a whole wide window..personally I am not tossing any egg that is still alive, no matter what the consequences may be. If I put them in the incu, it's my responsibility to see that through. If I have to cull, then so be it but I'd rather give them a chance at least..