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 Explosive Containers in Fallout 76 - Map
Where to find the Neon Lights/Letter Plans in Fallout 76?
Fallout TV Series "The Ghoul" Collectible | Fallout Figurine Collection
Where to find the BOS Jumpsuit in Fallout 76?
List of New Meat Week Plans for Fallout 76
Fallout 76 - Halloween Haunted House CAMP Builds
Where to Nuke to find/spawn the Wendigo Colossus - Map
Where to find Wood in Fallout 76 - Map