The Missing Apprentices

These side quests were never completed by Bethesda and cannot be completed.

Background
Lost Apprentices was a series of short quests to find four missing students from The College of Winterhold. The students were Borvir, Ilas-Tei, Rundi and Yisra. Their related quests are as follows:
 * Lost Apprentices: Borvir
 * Lost Apprentices: Ilas-tei
 * Lost Apprentices: Rundi
 * Lost Apprentices: Yisra

Upon speaking to Phinis Gestor, the discussion doesn't create a quest entry in the logbook. After finding the students and their respective belongings, there's no dialogue option to inform Phinis of their fate.

Phinis' Dialog
(Dovahkiin) ''"You said something about missing Apprentices?" ''

(Phinis) "Ah, that. Yes, the group prior to yours has disappeared entirely. It's possible that there was less than the necessary amount of oversite. That's still being looked into. But we've had no contact with them for quite some time now. Arniel wondered if perhaps they'd somehow managed to get themselves lost in the Outer Realms, but I think that's giving them too much credit."

(Dovahkiin) ''"Where could they have gone?" ''

(Phinis) "I'm not sure. None of them were working on anything terribly dangerous. As I recall, Yisra was trying to improve flame cloak spells to better work in Skyrim's harsh environment. Ilas-tei was practicing Illusions spells. She was having trouble with the calm spells, I believe, but only ever worked with skeevers. And then there's Borvir and Rundi. Twins, though they rarely agreed on anything. Those two boys were obsessed with mead. Convinced they could concoct something to compete with Honningbrew. Something about using Frost magic to chill the mead for a certain period of time. I felt it was a waste, but the Arch-Mage let them proceed."