Hey Gang...Figured this question is fairly advanced. Simply put how early can you cut an egg and what do you need to watch out for?

Reason: I have a clutch of eggs at day 46 they have started to get moldy and green (just started in the last 2 days not sure why they waited so long). However, they still have veins(though they are getting fewer everyday). I have seen movement in the eggs and it started me thinking at what point could I cut them to check for live animals (so I could remove any truly dead eggs) and/or to help a snake that might end up dying in the egg.

Nothing "special" expected form the eggs but I would still like to save as many of the babies as possible.