>>4649227 lb
Salvator Mundi (Da Vinci) painting likely fell apart during restoration (pic related). It was not worth $450M because the condition was so poor.
OLD story, but here is the sauce:
https://www.theguardian.com/artanddesign/2018/oct/14/leonardo-da-vinci-mystery-why-is-his-450m-masterpiece-really-being-kept-under-wraps-salvator-mundi