Sorry if these have been mentioned before. but if not a couple of YouTube rabbit holes.
"Finding Mike", a perfectly normal man working in an office called, Mike he makes friends with a co worker, Dylan. The business goes belly up but they stay in touch.
Then Mike has a sudden heart attack, the police can't find a next of kin so contact Dylan who had provided a reference for Mike to renew his passport.
The identity of the person in the passport has been stolen, if was a child who had died while young.
So Dylan goes looking for his friend.
I won't spoil it but it is worth a watch.
The other is a YouTuber called 'Mr Ballen' he has a few creepy stories but also some about disappearances, he gives the information in a story like way but he has at least one where he discusses people who disappear and then turn up later, alive but not realising time has past and some of them are found no where near they disappeared.