The Registry is a listing of all the missing Foundables known to the Ministry. Everything that has been reported missing can be found here. As you return Foundables to their appropriate time and place, your progress will be marked in your Registry. You can return to the Registry at any time to see which Foundables you’ve returned and which ones are still missing by going to your Suitcase 
When you fully return a Foundable, you’ll place a Sticker of it in the Registry. The returned Foundables will then appear in full color on the page. Some Foundables are fragmented and you will need to encounter these Foundable several times to return all the Fragments to completely return it. Foundables with missing fragments will appear as partially colored silhouettes. Foundables that you haven’t yet encountered appear as blank silhouettes in the Registry.
Earning Treasure TrunksAs you return more and more Foundables, you’ll earn Family XP to increase Family ranks and unlock Treasure Trunks. The rank bar at the top of the page tracks your progress towards reaching higher Registry ranks. In the example image below, earning 12 more Family XP will unlock Rank 2 and reward a Treasure Trunk. Return more Foundables of the same Registry Family to earn Treasure Trunks.
Prestiging a Registry PageOnce all Foundable fragments have been returned to a Registry page and all of the Stickers appear in full-color, you will receive Family XP for your efforts and the option to Prestige becomes available. When you Prestige a page, you will upgrade the page frame and reset all the Fragments so you can complete the page again. As a result, the number of Fragments needed to fully return a Foundable on pages you Prestige will increase. You do not have the option to Prestige pages in the Mysteries section.
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Harry Potter: Wizards Unite Game GUIDE
哈利波特：巫師聯盟