How to Specify a Collider in OnTriggerStay function?

I have Capsule and Box Colliders in NPC GameObjects and Player GameObject. I use Box Colliders as trigger, because I want to use OnTriggerStay to interact Player and NPCs

However, I dont want to repeat same action on one NPC, therefore I want to disable the Box Collider of NPC I interacted with, but after i do this via script, Player and NPC can interact again(even without triggers)

I want to specify the Box Collider in OnTriggerStay function. How can I achieve this?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class playerInteraction : MonoBehaviour
 {
     private GameObject triggeringNPC;
     private bool triggering;
     public GameObject pickpocketText;
     public GameObject PickpocketingText;
     
 
     public float timer = 0;
     
 
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         if (triggering)
         {
             pickpocketText.SetActive(true);
             PickpocketingText.SetActive(false);
             if (Input.GetKey(KeyCode.F))
             {
                 timer += Time.deltaTime;  
             }
 
             if(timer>0.1f)
             {
                 pickpocketText.SetActive(false);
                 PickpocketingText.SetActive(true);
             }
             if (Input.GetKeyUp(KeyCode.F) && timer < 3)
             {
                 print("pickpocket failed");
                 timer = 0;
             }
             if (Input.GetKeyUp(KeyCode.F) && timer >= 3)
             {
                 print("++++++money" + triggeringNPC);
                 timer = 0;
                 triggeringNPC.GetComponent<BoxCollider>().enabled = false;
                 GetComponent<BoxCollider>().enabled = false;
 
             }
 
         }
         else
         {
             pickpocketText.SetActive(false);
             PickpocketingText.SetActive(false);
         }
     }
 
     void OnTriggerEnter(Collider other)
     {
         if(other.tag == "NPC")
         {
             triggering = true;
             triggeringNPC = other.gameObject;
 
         }
     }
 
     private void OnTriggerStay(Collider other)
     {
         if(other.tag == "NPC")
         {
             triggering = true;
             triggeringNPC = other.gameObject;
             if (Input.GetKey(KeyCode.F))
             {
                 pickpocketText.SetActive(false);
 
             }
         }
     }
 
     void OnTriggerExit(Collider other)
     {
         if (other.tag == "NPC")
         {
             triggering = false;
             triggeringNPC = null;
         }
     }
 }