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I currently have two RFID cards (CYC and EH) in a little two-card wallet* stored in the armrest compartment.

I'm assuming that RFID cards are completely passive, so having two in close proximity won't cause any problems?

* Used to contain my free bus pass, which I used about twice! :)
 

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I'm assuming that RFID cards are completely passive, so having two in close proximity won't cause any problems?
For storage, yes - there's no power source so nothing whatever will happen.

When you come to use them, you will probably need to take them out of the wallet to make sure that only the one you want gets activated - otherwise it might read the wrong one, or attempt to read both at once and end up reading neither. No permanent harm done even if you do that.
 
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