• Had typed a long reply but hit the back button and lost it.

    Google shed shackle.

    For the door is used u-hasps and discuss locks.

    Two part epoxy in any accessible screw heads (hinges etc).

    Reenforce the wall corners with additional screws internally to help delay them prying the walls off. Same for the roof.

    Or, bin it all, get a concrete base and a "heavy duty" shed with tongue and groove wall and roof panels.

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