Problems with my plot

[pengyy]

Username : Pengy2552
Plot : bludhouse-19
Underneath there are some chests on the edges. I cannot open them as it says it is not part of my plot. But the chests are still there. How can I break the chests?

 

[Shadow_stalker77]

@sundae22 or I can break the chests as soon as possible

 

[sundae22]

Removed the chests and put a new wall on the boundary