Hi Mainguy and welcome to Pet Talk.
I'm with AmberLee on this one re: Tiger. Leave him and sit quietly near him - talk to him and don't try and get him out. He's obviously feeling safe in his 'hidey hole' and when he's sure it's safe 'out there' he'll come and explore. It may take a long time - go at his speed.
We had this with our Ketchum and it took ages to get him out of the computer room (hidden under the desk!). These days he still has his own hidey hole and thats under our bed! He's safe there and no-one bothers him. He's a very nervous cat - but such a lovely boy.
Don't give up with Tiger - I'll bet he'll grow up to love you so much.
Do you really have a limit to the number of cats you can have in your home, over there? I didn't know that. Wayne has 12 - but thats in Kansas!

Lynne