These eggs are quest items for the second part of Bleed Me Dry. Red Lucy of The Thorn will give the Courier 300 caps for them or 400 caps with a Barter check. It spawns once this part of the quest has started, and is interacted with, not taken.
The pile in which the eggs will spawn in a grooved mountainous area just north of Goodsprings Cemetery. The marker points out the exact location.
This is the only way to complete this part of the quest.