We have veileds hatching this weekend. The eggs turned an awful yellowish greenish-gray color and shrank first. Some pipped early, some later. With some the egg totally collapsed and crumpled, but I could not tell the cham had pipped except by carefully looking at each end of the egg (while it lay there- not picking it up) with a magnifying glass. Upon close observation I could just see the chams' lips inside a crumpled pipped area. Some lay like that for more than a day. Don't know if this fits your situation, but just thought I'd add my two cents. THis is our first clutch of veiled eggs to hatch so I had no personal experience of what to expect. One of the eggs was really cute. It was all crumpled up, but I noticed the tail was sticking out, perfectly coiled. But the tail was white. I thought, guess that one didn't make it. I touched the tail, and it moved. I got the magnifying glass and looked and I could see the pipped area, with the whole tail out of the egg and coiled, and little feet right by the tail, and behind the little feet were the cham's lips. The feet and lips were a nice light green color. So, I realized, this guys okay, he's just sort of breeching. He came out, just fine, in his own time.
A few of the babies lay in the pipped shell for a couple of days. And then came out on their own. Only about 1/4 of the clutch has hatched so far.