I Bought The World's Largest Mystery Box! ($500,000)

I don't have access to real-time information or specific details about Mr. Beast's videos beyond my last knowledge update in September 2021. However, based on the title you provided, "I Bought The World's Largest Mystery Box! ($500,000)," it appears to be one of Mr. Beast's typical challenge or unboxing videos where he purchases an expensive mystery box and showcases its contents, often for the purpose of entertainment and charity. You can find the video on Mr. Beast's YouTube channel for the full experience and details.