When a ceramic relief depicting the Madonna with Child was returned to the church of Scansano in Tuscany, Italy, after five decades of absence, the town threw a solemn celebration. The local bishop, priest, prefect, mayor, and law enforcement officials all attended. On a September morning in 2020, a crowd gathered. The torso-sized relief was propped up, surrounded by plants. A band blared nearby. The relief, by celebrated Renaissance sculptor Andrea della Robbia, had been stolen on a summer night in 1971, and had been missing ever since. “I was…