Retention for Sent Folder on Mailbox is only 2 weeks.. people are missing email in Sent on their Archive

So we have the 90 day archive policy set up for our litigation hold folks. The problem appears that we have a 2 week retention for our Sent folder in their mailbox.

We're seeing that when people check the Sent folder on their archive, that it's only displaying emails that are 90 days old or older. So there's a huge gap of 15th day emails and the 89th day emails.

Does the vault hold these emails until the email is 90 days and then present it to them? If so, is there any way to get the vault to show those emails sooner rather than waiting the 90 days?