Remember that these often need long daylight hours to eclose same season. If they don't eclose within 5 weeks, they will need to be refrigerated for at least a few months. Bad eggs are usually darker and shrivel up pretty quickly, but not all the time. If they're bieng fed, then it's pretty likely your eggs are good. Moths dont fertilize internally, the female collects sperm from male and eggs are fertilized as theyre bieng laid, im pretty sure the sperm is with the "glue" the female produces to stick eggs to hostplant. I put mine in small plastic containers with paper towel and a few drops on water and put them on top of my dvr which usually stays at 79 degrees and they will hatch in 4 to 6 days that way. I breed a few diff. Sphinx species so I could be off by a day or two I know one species I breed hatches within 3 days. If you dont need the eggs, please donate them to a local reptile shelter! If you don't like collecting eggs, put females in separate cage lined with newspaper and a feeder, it's a hell of a lot easier to cut the eggs offpaper than to scrape them off of everything.