Get world position of random point inside bounds

Question

I am trying to get a random world position inside my targets collider, so that I can fire an arrow at it.

I have tried a bunch of different solution but can't seem to get it right, for example (this code is on my target):

//Inside Awake
colliders = GetComponentsInChildren<Collider>(); //I want this to work on a unit with a single capsule collider and a building with 8 different box colliders

public Vector3 GetRandomPoint()
{
    Bounds b = new Bounds();

    for (int i = 0; i < colliders.Length; i++)
    {
        b.Encapsulate(colliders[i].bounds);
    }

    float minX = gameObject.transform.position.x - gameObject.transform.localScale.x * bounds.size.x * 0.5f;
    float minZ = gameObject.transform.position.z - gameObject.transform.localScale.z * bounds.size.z * 0.5f;

    return new Vector3(Random.Range (minX, -minX),
                           gameObject.transform.position.y,
                           Random.Range (minZ, -minZ));
    }

In the scenario I'm having issues with right now, the trageet simply has a single capsule collider.

This return a point quite far away from my target, but I cant find the issue.

EDIT:

Here is another one I tried without success:

public Vector3 GetRandomPoint()
    {
        Bounds b = new Bounds();

        for (int i = 0; i < colliders.Length; i++)
        {
            b.Encapsulate(colliders[i].bounds);
        }

        var target = new Vector3(
            UnityEngine.Random.Range(b.min.x, b.max.x),
            UnityEngine.Random.Range(b.min.y, b.max.y),
            UnityEngine.Random.Range(b.min.z, b.max.z)
        );

        return b.ClosestPoint(target);
    }

Answer 1

As instructed by @DMGregory, using new Bounds will use world origin, if I instead just use the first collider in the list, it works as intended:

public Vector3 GetRandomPoint()
    {
        Bounds b = colliders[0].bounds;

        for (int i = 1; i < colliders.Length; i++)
        {
            b.Encapsulate(colliders[i].bounds);
        }

        var target = new Vector3(
            UnityEngine.Random.Range(b.min.x, b.max.x),
            UnityEngine.Random.Range(b.min.y, b.max.y),
            UnityEngine.Random.Range(b.min.z, b.max.z)
        );

        return b.ClosestPoint(target);
    }