https://cdnph.upi.com/ph/st/th/5261786449419/2026/upi_com/49f3a1d0261f0e6199d39b2062290aa2/v1.5/Coveted-Cooper-Flagg-1-of-1-rookie-card-found-in-Rhode-Island.jpg" /> A coveted Cooper Flagg one-of-one rookie card was found in Rhode Island after the Dallas Mavericks offered an enticing haul to whoever found it.