Box wont collide with anything when picked up

Hello there, I'm making a Box pick up script and I'm having some issues with making the box collide with stuff. ( https://gyazo.com/21ddc772244ee938765d08a677df9c93 ) I want it to collide with the walls and other boxes. my code:

  using System.Collections;
  using System.Collections.Generic;
  using System.Data;
  using UnityEditor.Timeline;
  using UnityEngine;
  
  public class BoxScript : MonoBehaviour
  {
      public Transform Box;
      public Transform Player;
      public Transform BoxPosition;
      public Transform Map;
      public bool isHolding = false;
      public int maxDist = 5;
  
      private void OnMouseOver()
      {
          if (Input.GetMouseButtonDown(0))
          {
              if (isHolding == false)
              {
                  if (Vector3.Distance(Player.transform.position, Box.transform.position) < maxDist)
                  {
                      isHolding = true;
                      Debug.Log("Grab");
                      Box.GetComponent<Rigidbody>().isKinematic = true;
                      Box.position = BoxPosition.position;
                      Box.parent = BoxPosition;
                  }
              }
          }
      }
      private void Update()
      {
          if (isHolding == true)
          {
              if (Input.GetMouseButtonUp(0))
              {
                  isHolding = false;
                  Debug.Log("Drop");
                  Box.GetComponent<Rigidbody>().isKinematic = false;
                  Box.parent = Map;
              }
          }
      }
  }