Deleting Fixed Assets

Summary: When we went live with Oracle, almost 3 years ago - we loaded assets for a business unit that did not move over to Oracle at that point in time. We are now in the process of going live with the BU, but the assets are now three years old and apparently depreciation was run on them for one period - Dec 2018. We would like to reload the assets and start over, but it does not appear we can delete them and there are about 1200 assets so retiring them all would be fairly time consuming. Would anyone