(Updated with more codes 11/20/2012) In-game item passcodes for Ingress [NOT INVITE OR ACTIVATION CODE]
These are not invite codes to get into the beta, you must have access already to use them
To enter click on "ops" then at the bottom you will see "enter passcode" enter them there.
Not sure how long these work or if using them at a later level will get you better rewards but I ued them all up front just incase they go away.
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Updated regularly, as of 11/20 it has 31 passcodes.
Ingress Passcode Database