Cloned Centos Boxes - First Run to run again?

["Mr Gabriel" <gabriel@xxxxxxxxxxxxxxxxxx>]

I need to build a bank of 12 centos boxes, for an experiment I'm doing. 
I don't want to install centos 12 times, I'm using virtual box across 
three machines, how can I get the first run scripts to run again to that 
the box is reconfigured on it's next boot.

I want each box to appear like a fresh unique install.
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