Microsoft retains files deleted for 30 days.
Individual: Click Recycle bin on the left side of your OneDrive page>Select the appropriate file(s)>Click Restore at the top of the page. If you do not find the file(s) you are looking for then also scroll to the bottom of the page and click on the link that states "Second-stage recycle bin".
Archive: Enter the url of the archive provided by IT into the url address window in a browser>Click the Settings button (looks like a gear)>Click the "Restore your OneDrive" link at the top right of the window>Click the drop down next to "Select a date" and make the appropriate choice>It is possible to view and restore files deleted from 0 to 29 days ago by moving the slider bar.