You may as well send a copy of your P45 to this address as well , as you were't paying tax , but you do say that you paid some PRSI , .
So if your earnings are below a certain amount , and you have A1 contributions , you may qualify for some refund .
If you have medical card - send them a copy of this too
Department of Social and Family Affairs
PRSI Refunds,
Oisín House,
Pearse St.,
Dublin 2