Please advice

When applying for the Verification of answr books online im asked to enter the 4 digit pin number that i had given in the application form for the may 2012 exam , i dont remember taking any copy of the printout form when i applied for the may 12 exam , neither is a copy saved in my system. i dont seem to have the 4 digit pin no that i had given months back , is there any alternative , please suggest on what is to be done , would really appreciate it