Yes. Humans really liked burying things. Burying prized or expensive objects was pretty normal in human history. Layers of dirt only piled on with time. I don't think humans did much Archaeology pre-19th century. There are buckets of ancient coins. I leave this evidence of old metal laying around: "The Horses of Saint Mark, also known as Triumphal Quadriga, 2nd or 3rd century CE, via Basilica di San Marco, Venice"