1.    View the Mice:

• Go to Mice
• Filter
• Select Living Status
• Unselect Alive and Select Transferred
• Apply

(Add filter by strain or whatever helps you see these animals)

2.    Update the mice:

• Click on the animal's 3 dot edit menu
• Select Edit in the drop down
• Go to Transferred and switch it on and then off again
• Click Save

*The animal will now be marked as Alive (not have the x-fer but show its age again) and you can do the same with the other animals. 

*When you go back to the filter by Alive you will see them.