The area has some basic crafting materials and three quest items for the sidequest “Out in Left Field”
Signed Catcher’s Mitt – red toolbox in the shed
Signed Baseball Card – chem cooler in the shack in the middle of the yard
Signed Baseball – in a Novice Safe, 2nd floor of the main house
In the elevated shack in the middle of the flooded yard, there's an issue of Unstoppables on the floor, beside the mattress.