thanks for your suggestion; so I checked my account transactions and picked a purchase from the list made over a year ago (e.g. 2/25/2023) on the ‘Unreal Engine Marketplace’. First, noticed how all those transaction source (marketplace) are now showing up as ‘Fab Marketplace’. The items do show up as ‘Owned’ when I view the ‘Seller’ (e.g. PolyArt3D). But none are displayed when using a new install of Unreal Launcher / Vault is showing (free monthly) items recently added only.
I’ll have to find a way to open a ticket with Fab Marketplace support then to sort this.