When you restore items, you can show and then restore items that are deleted.
From the navigation pane, go to Protect > Applications > Office 365.
The Office 365 apps page appears.
In the Name column, click the app that contains the team that you want to restore.
The app page appears.
On the Teams tab, select the check box for the team that contains the items that you want to restore, click the Restore button, and then select Restore items.
The team restore page appears.
In the Name column, click the name of the channel that contains the items that you want to restore.
The items that you can restore appear.
Click an item, click the action button at the top of the page, and then click Show deleted items.