Where did you discover these honorary GMs? Maybe there's no info at FIDE because these titles only exist in someone's imagination, misinterpretation or mistranslation.
Honorary GrandMaster

I first found Corry Vreeken at http://xaa.dohd.org/rating/titels.php#hwgm
Then I Googled and found the list here: http://www.anusha.com/world-gm.htm
______________________________________________________________________
Check out my Chesschannel on Youtube http://www.youtube.com/user/ArtsewS
Honorary grandmasters[edit]
From 1977 until 2003, FIDE awarded honorary Grandmaster titles to 31 players based on their past performances or other contributions to chess. Since 2007, no distinction has been made between an "honorary" grandmaster and a full grandmaster. The following players have been awarded honorary Grandmaster titles:
- 1977 - Julio Bolbochán, Esteban Canal, Borislav Milić, Carlos Torre Repetto
- 1981 - Arnold Denker
- 1982 - Lodewijk Prins, Raúl Sanguinetti
- 1983 - Vladimir Alatortsev, Alexander Konstantinopolsky, Erik Lundin
- 1984 - Eero Böök, Stojan Puc
- 1985 - Harry Golombek, Mario Monticelli, Jaroslav Šajtar
- 1986 - Arthur Dake, Theodor Ghiţescu
- 1987 - Vladimir Makogonov, Vladas Mikėnas, Bogdan Śliwa
- 1988 - George Koltanowski
- 1990 - Andrija Fuderer, Rudolf Marić
- 1991 - Dragoljub Minić
- 1992 - Heinz Lehmann, Rudolf Teschner
- 1993 - Jonathan Penrose
- 1996 - Károly Honfi, Enrico Paoli
- 1999 - Péter Dely
- 2003 - Elmārs Zemgalis
from wiki
That is odd, I don't see János Flesch on that list: https://en.wikipedia.org/wiki/J%C3%A1nos_Flesch
I had been researching a bit to see why he was awarded the honorary GM title in 1980, but no luck. Anyone know?

From 1977 until 2003, FIDE awarded honorary Grandmaster titles to 31 players based on their past performances or other contributions to chess. Since 2007, no distinction has been made between an "honorary" grandmaster and a full grandmaster. The following players have been awarded honorary Grandmaster titles:
- 1977 - Julio Bolbochán, Esteban Canal, Borislav Milić, Carlos Torre Repetto
- 1981 - Arnold Denker
- 1982 - Lodewijk Prins, Raúl Sanguinetti
- 1983 - Vladimir Alatortsev, Alexander Konstantinopolsky, Erik Lundin
- 1984 - Eero Böök, Stojan Puc
- 1985 - Harry Golombek, Mario Monticelli, Jaroslav Šajtar
- 1986 - Arthur Dake, Theodor Ghiţescu
- 1987 - Vladimir Makogonov, Vladas Mikėnas, Bogdan Śliwa
- 1988 - George Koltanowski
- 1990 - Andrija Fuderer, Rudolf Marić
- 1991 - Dragoljub Minić
- 1992 - Heinz Lehmann, Rudolf Teschner
- 1993 - Jonathan Penrose
- 1996 - Károly Honfi, Enrico Paoli
- 1999 - Péter Dely
- 2003 - Elmārs Zemgalis
from wiki
in this list, guess the surprise was Vladas Mikenas, i have checked his games abit cos i sometimes play Mikenas opening and guy is so good used to think he is GM, also i think FIDE should award Donald Bryne with honorably GM
So I discovered that there are Honorary GM's and Honorary WGM's on our planet:
HGM Heinz Lehmann
HGM Vladimir Makaganov
HGM Vladas Mikenas
HGM Dragoljub Minic
HGM Rudolf Teschner
HWGM Corry Vreeken
Can't find anything about this title on FIDE. Does anyone know more about how the above players became H(W)GM?
______________________________________________________________________