If they do get taken by customs, they'll contact you either by calling you or sending a cop to your door. Just tell them you are studying security or something similar, there is nothing illegal about owning them here unless you are doing so with criminal intent.
There is a previous thread from a couple of years ago discussing it here viewtopic.php?f=8&t=47173
I highly doubt you'll have any issues unless you've had previous convictions or some other reason to have them confiscated.
Having said that I have hard drive (of all things) sitting in customs with a note stating they need more information from the shipper (DHL). First time I've run into anything like that but from what I understand, it should be released pretty quickly.
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