Do I need my CK study books after passing the test?

[DoctorWannaBe]

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Is there any need to keep my First Aid for Step 2 CK book (i.e. for step 3 or residency)? I kept my old First Aid for USMLE Step 1 book because I thought I might use it again someday (I haven't), so I'd like to get rid of the Step 2 book if I won't ever use it again.