Redundancy Paperwork from Employer - what to do with various forms

Made redundant at end of 2010
My former employee has supplied me with

• A completed form for Refund of Prsi Contributions or Health Levy - PRSIRef1
• A income levy cert on cessation of employment
• A yellow coloured form Cessation Certificat - P45(c) that seems to have 3 parts - new employer copy, Applicatino for new cert of tax credits, Required when claiming benefits from s/w

What do i do with these forms. Who do i give them too.
Do i send the Refund of PRSI contribution form back to Dept S/W now or do i do this only at certain point in time
Thanks