4 bolts from door plug that blew out on Boeing 737 MAX 9 yet to be found; NTSB officials unsure they 'existed'

https://www.kgw.com/article/news/local/ntsb-door-plug-alaska-airlines-flight-guide-tracks-fractured-pdx/283-773b6812-5a04-48c5-a376-aef1ac1eb642