The lack of security on the Hillary server was the intentional delivery courier of paid for secrets. Instead of actually walking the secrets on a disk to a buyer where that was clear evidence of espionage, she just lowered the security and let it be taken. Passive courier delivery agent is still an intentional act of espionage and playing ignorant, ms. clean-it-with-a-cloth, is not going to work.
I've believed that to be the case since I first heard about this story, that it was done deliberately for just the reason you state. I admit, though, that this is the first time I've seen the phrase "passive courier delivery agent".