It's a 2nd hand account of a "my friend told me" anecdote published in newspapers which have, at best, an accidental relationship with the truth. I'm not saying it isn't true but given the messengers I'd be astonished it it was.
This has been cycling around at Bleeding Cool for months. Their latest update explains how the still unsubstantiated rumour got out of control<p><a href="http://www.bleedingcool.com/2013/10/06/video-sky-news-get-in-on-the-doctor-who-missing-episodes-rumour-too/" rel="nofollow">http://www.bleedingcool.com/2013/10/06/video-sky-news-get-in...</a>
Doctor Who Online is reporting that lost episodes indeed were found. "Not as many as 100".<p><a href="https://twitter.com/DrWhoOnline/status/386850513909600256" rel="nofollow">https://twitter.com/DrWhoOnline/status/386850513909600256</a>
<a href="https://twitter.com/DrWhoOnline/status/386850763349041152" rel="nofollow">https://twitter.com/DrWhoOnline/status/386850763349041152</a>
<a href="https://twitter.com/DrWhoOnline/status/386851026038296577" rel="nofollow">https://twitter.com/DrWhoOnline/status/386851026038296577</a>
<a href="https://twitter.com/DrWhoOnline/status/386863277134721025" rel="nofollow">https://twitter.com/DrWhoOnline/status/386863277134721025</a>
<a href="http://www.bbc.co.uk/news/entertainment-arts-24448063" rel="nofollow">http://www.bbc.co.uk/news/entertainment-arts-24448063</a>
bbc reporting on it now.
"BBC Worldwide is expected to confirm the find at a press conference in London later this week."
I'm assuming they were sold to Ethiopia for the reusable tape, not to air the show. Then again ETV (the ethiopian state-run TV station) does air random stuff every once in a while.