[Dovecot] OT: ctimes

I am going to convert my 32-bit Debian system to a 64-bit Debian system today. But, after I move my maildir files over to the new hard drive the ctimes are going to get modified to current time and mess up my automatic purge scripts for the Deleted Items folders. Is it possible for me to either keep the existing ctimes or is it possible for me to modify the ctimes to the date headers of the emails after I move the files?

Thanks, Jeff