If you click the map image above it will provide you an easy to use Map of All Locked Toolboxes. The toolboxes contain various items from plans to scrap and ammo. You can also click this link to see the map too.
While searching you just might find the plan to create your own toolbox to display in your C.A.M.P. Here is an image of the stash boxes you can use. You might also want to check out the Locked Safes locations that are throughout the wasteland.
Where to find/farm Super Mutant Hound Locations in Fallout 76?
Where to find/farm Ballistic Fiber in Fallout 76
A List of Some Easter Eggs in Fallout 76
Where to find/farm Hermit Crab Locations in Fallout 76?
Where to find brooms in Fallout 76?
Where are Mole Rats located in Fallout 76?
Fallout Vault 76 Car Air Freshener
Where to Find a Shovel in Fallout 76?