SMS and iMessages are stored together.
It's going to be in sms.db.
So this file also hasn't changed.
However, the creation dates of the container
are sometimes finicky, so I don't
want you to rely upon it when I tell you to compare containers.
Under Attachments, exactly what you would think you're going
to find-- under Drafts, what you think you would find--
and then comm.apple.MobileSMS.plist--
extremely importan file.
This file is going to track your days to keep messages.
The default is forever.
However, if you look at mine, I changed mine to 365.
I want to keep my messages for a year, and then purge them.
You can change it to 30 days.
You could change it to one day.
So depending on what you change it to,
that is going to impact your forensic examination.
So if you're trying to find messages,
before you drive yourself insane, go to this plist
and see how many days they're keeping these messages.