Zaran
Adventurer
Give the NPCs the magical items you think they should have. They don't have to be more powerful than the PCs' magical items. They don't have to useful to the PCs. If you pit another adventuring party against them with similar experience then they should have a similar amount of magical items. In my opinion, major NPCs should be the main source for magical items with underlings not having any.
That being said there is no reason why a NPC has to have every slot filled with Magic items. During their life they may have encountered as many as your PCs but like the PCs had to share them with others and might not have been able to use the items found.
That being said there is no reason why a NPC has to have every slot filled with Magic items. During their life they may have encountered as many as your PCs but like the PCs had to share them with others and might not have been able to use the items found.