How to activate the expiration Serial Number to Symantec Endpoint Protection Manager 12.1 (Don't want to renew the license)

This is my situation.

I bought SEP license in this details.

1. SEP 12.1     5 Seats Licenses     Expiration 5/29/2013

2. SEP 12.1   60 Seats Licenses     Expiration 7/21/2013 

3. SEP 12.1    8 Seats Licenses      Expiration 7/25/2014

I use one Windows 2003 PC for install Symantec Endpoint Protection Manager for manage all seats.

I already activated all three Serial Number, I create the Client Install Package and install to 73 clients.

It work verry well, no any problem, event the licenses already expire.

But this month the hardisk of management server was broken !!! and I didn't backup anything.

I had to replaced new hardisk and installed Windows 2003 and SEPM 12.1 (same old system).

then i cannot activate all three  serial number, I don't have any seats for my all clients.

How can it activate it?

I don't want to renew because for save cost and event it expired it still update virus definition, It's OK for us.

thank you.