You have an opportunity to restore the items looted from your Shelter during PvP for Tokens.
To get Tokens:
1. Open Circle of Power
2. Place items you do not need in the slot for destruction.
3. Claim Tokens after the destruction is over.
Or just purchase them for Sapphires in the Bank.
To restore looted Items:
Open in-game Bank - an icon with Sapphires at the top-right corner
Switch to the "Recovery" tab
Choose the items and set their quantity
Press the button "Recover"
N.B. Items and materials are stored in the Recovery for 7 days (168 hours), then they expire.