Tanks owned by your company (but NOT associated with an individual customer account) are held in the "Yard File". Here's how to see them.
From the Lynx Main Menu . . .
1. Left-click on Tanks.
2. A drop down menu will appear
3. Left-click on View Yard Tanks and Equipment.
4. This will display the Yard Tanks and Equipment window which will show you all of the tanks currently assigned to account 0 (zero) as well as other pertinent information about each tank in this account.
5. When you're done, left-click the close button to return to the Lynx Main Menu.