A recent surge in high-profile thefts targeting sports memorabilia has experts warning collectors and buyers to be vigilant. Thieves are reportedly stealing valuable items such as LeBron James jerseys and Mickey Mantle cards, with the stolen goods estimated to be worth millions of dollars. Authorities are investigating the heists, and experts are advising potential buyers to take precautions to avoid inadvertently purchasing stolen items. These precautions include verifying the seller's reputation, demanding provenance documentation, and scrutinizing the item's history before making a purchase. The increase in these thefts highlights the need for greater security measures within the sports memorabilia market.