Camera in changing scenes automatically assign a boxcollider in the Inspecter.

I have a Gameobject with a boxcollider2D on it and Camera with the following code on it:

using UnityEngine;
using System.Collections;
public class FollowCamera : MonoBehaviour {


	    public Transform Player;
	    private static bool CamExists;

		public Vector2 
		Margin,
		Smoothing;

	    public BoxCollider2D Bounds;

		private Vector3
		_min,
		_max;

		public bool IsFollowing { get; set; }

		public void Start()
		{
			_min = Bounds.bounds.min;
			_max = Bounds.bounds.max;
			IsFollowing = true;
		if (!CamExists) {
		CamExists = true;
		DontDestroyOnLoad (transform.gameObject);

		} else {
		Destroy (gameObject);
		}
		}

		public void Update()
		{
			var x = transform.position.x;
			var y = transform.position.y;

			if (IsFollowing) 
			{
				if (Mathf.Abs(x = Player.position.x) > Margin.x)
					x = Mathf.Lerp (x, Player.position.x, Smoothing.x * Time.deltaTime);

				if (Mathf.Abs(y = Player.position.y) > Margin.y)
					y = Mathf.Lerp(y, Player.position.x, Smoothing.y * Time.deltaTime);

			}

			var cameraHalfWidth = GetComponent<Camera>().orthographicSize * ((float)Screen.width / Screen.height);?

			x = Mathf.Clamp(x, _min.x + cameraHalfWidth, _max.x - cameraHalfWidth);
			y = Mathf.Clamp(y, _min.y + GetComponent<Camera>().orthographicSize, _max.y - GetComponent<Camera>().orthographicSize);

			transform.position = new Vector3 (x, y, -10);

		}
	}

My BoxCollider2D tells the Camera when to stop. But the shape of it must change from scene to scene. How do I set the public BoxCollider2D to be the right shape in runtime? Thanks

Sorry, I fixed the problem myself. Instead of writing this:

if (!CamExists) {
		CamExists = true;
		DontDestroyOnLoad (transform.gameObject);

		} else {
		Destroy (gameObject);
		}

I have it so the Camera finds the player in every different scene:

Player = GameObject.FindWithTag ("Player").transform;