Are monitors like igs at all? Iguanas go through a breeding season and the females will lay eggs once a year whether they're fertile or not (a bit like chickens, only in one big clump at once instead of one every day or every other day for a good chuck of the year). Even if the eggs look good I would candle them to see if they're even fertile, sound like the "guy" didn't get a lot of time with Gunter.