Only 17% is REPORTED in this thread, but I'm sure the whole 90% was returned.
There were 8762 BTC returned in two chains: 5000 BTC and 3762 BTC.
The last 1000 BTC of the latter was mistakenly distributed as double payments.
There begins a chain of 5000 BTC and 3762 BTC.
The latter ends at: http://blockchain.info/address/12rebn6xb2VJt5YfMokUJvV4msdr7KohfG with amount of 1,058.54 BTC
It was used today to the 1000 BTC chain with duplicates of part of the payments from 3762 BTC chain, but in different order.
Sometimes the same address was used for supposedly different accounts,
for instance: http://blockchain.info/address/19mvuvS2VgCWDtfGpsLnJAPhBp2ZcWM3xQ
(two of its payments, 139+ and 421+ BTC, are not duplicated, but one, 55+ BTC, is).
The last example has proven to be of money returned to DeaDTerra:
55.7246187 BTC http://blockchain.info/address/14CQiJAiA5o8go8PWc27BjkNA4v2t7QFEt
//DeaDTerra
As you see, Nefario supposedly returned near all BTC of users, but the last 1000 BTC which went to improper people.
So part of the people (~1/9) still got nothing, but they should get their money soon, when most of the 1000 BTC is paid back and Nefario send it again, with proper addresses this time.
I thought its pretty hard to guess how much was paid back because he used some kind of anonymizing chain system with the addresses to pay back. And it sounds a bit strange when really so much is paid back already and only 17% of the payments are noticed here. Seems a bit small. Even though there are many that didnt get payment yet. It doesnt sound to me like a small group. But of course its only a feeling because lack of numbers.
And it doesnt make much sense because of the script that did the double payment. I mean when nefario already had paid back 7762BTC and then is crating a script that is causing 1000BTC to go to users that already got money back... why should he build a script when he was at the end of the list already? It doesnt make sense to create a script when payments are nearly finished.
Care to explain where you have this numbers from? I mean even nefario didnt claim that he already paid back 90% of users money. Which would be a good thing to let go away accuses of he being a scammer regarding the users money.