It would appear that during an Enterprise Vault (EV) Collection P1 information is not being included with the items emails collected from a Journal Archive.
This was verified after opening a copy of the collected PST.
It would appear that the P1 info failed to be retrieved from storage on the EV server as the StorageOnlineOPNSps.dll needed to be re-registered.
The StorageOnlineOPNSps.dll needs to be reregistered on the Clearwell (CW) server as follows:
Clearwell (CW) v712 Fix 2
Enterprise Vault (EV) API Runtime 10.0.3
Enterprise Vault (EV) 10.0.3