These are real fossil Stylemys tortoise eggs (Stylemys nebrascensis)!
They were excavated in Custer County, South Dakota (Brule Formation) and come in ~4.25" wide riker frames.
Each one is unique but the photos are representative of the quality you will receive. These reptile fossils can be shipped worldwide.
Dating back to ~30 million years before present, these extinct Oligocene reptiles roamed what became the White River Badlands of South Dakota. They were the first fossil genus of dry land tortoise discovered in the USA.