EV - is it possible to change the date when an email was journaled prior to the archiving process

Hi

Environment is 9.0.2

We need to re-export some old messages from our IM capturing system (this system emails the Exchange journal mailbox, which gets archived by EV).

However, I want the received date of the messages to be 3 months ago which is an accurate representation of when the IM chat took place, so when the email gets archived by EV and then searched for in DA, it will appear to be 3 months old instead of brand new.

Is it possible to do this? I was thinking of getting all of the messages into a new journal mailbox, then having some process (e.g. script) which will modify the received date of the messages, then turning on archiving of that new mailbox.

Any suggestions?