4 points
A lot of it is single board, but there are smaller PCB layered in there connected by ribbon cables or press-in connections. I replaced the battery in my iphone and it’s a tedious but doable DIY project. Anyway, the way it’s assembled doesn’t lend itself to missing parts. Parts of or the whole phone won’t work. No way would phone arrive “missing” parts - unless there was external damage to any cameras or switches.