Answered like a typical obsessive. ;)

Those lost episodes...are they the same ones Levine is suspected of hoarding?

HA! That's an interesting question.

To be fair to him , he's put in loads of his own time & money into looking for them & if it wasn't for him going to the BBC in 1977 and asking about what was going on with those old episodes there would be a lot less ones existing now than there are.

But...

He uses this fact to fuel his own ego , countless number of times when someone disagrees with him on Doctor Who forums he'll start chanting his 'I was the show's continuity advisor in the 80s , I've done more to find missing episodes than anyone , blah blah blah'. I respect what he's done but the guy is a complete ****.

The whole story about him hoarding episodes comes from the 80s when a missing William Hartnell episode was returned from a TV station in Nigeria when the print arrived they found out that it was in poor condition , Levine contacted the BBC and said that he had a better copy. Levine maintains that the BBC already knew he was in possession of it and that he was there as back up in case the print was unusable , but a lot of fans think there was something else going on.

Wouldn't surprise me if there was.
Well, as you know he's an avid rare soul collector and his reputation is similar on the scene.
His contribution is enormous, maybe even unparalleled, but he's been accused of similar activities before.
It's not unusual to hold back on rare copies, especially if it increases the value of the ones you're known to have.
Especially over time.

Here's a clip from my favourite ever Doctor Who story 1979's City Of Death , written by Douglas Adams and starring Tom Baker :D

No clue why i watch the new Doctor Who, it really is corny, but i love it.