How i can limited several objects from list?!

I have 10 Trash objects from list i want confirm limited several objects of this list.

I want limited list this code:

     using System.Collections.Generic;
     using UnityEngine;
     
     public class Spawner : MonoBehaviour
     {
         public GameObject player;
         public List<GameObject> rubbish;
         public List<GameObject> rightObjects;
         public List<TrashType> generateTypes;
         public Transform spawnPoint;
         public int sizeOfList = 10;
         public int ObjectsReq = 5;
         public float spawnTime = 2f;
         public float resSpawnTimer;
         public float lastSpawn;
         public float spawnStartertime;
     
     
         void Start()
         {
             FilledList();
     
             Spawn();
         }
     
     
     
         public void Spawn()
         {
     
             if (spawnStartertime < resSpawnTimer + lastSpawn)
             {
     
                 var rnd = Random.Range(0, rubbish.Count);
     
                 Instantiate(rubbish[rnd]);
                 rubbish.RemoveAt(rnd);
                 
     
                 //print(rnd);
                 lastSpawn = Time.time;
             }
     
             if (rubbish.Count.Equals(0))
             {
                 print("List is empty");
     
                 TrashGameManager.instance.LevelCompleted();
                 CancelInvoke("Spawn");
             }
     
     
         }
     
         public void FilledList()
         {
            
             // Filled Trashlist Trash Objects.
             
             // Find trash accepted types.
             var trashcans = FindObjectsOfType<TrashDestroy>();
             generateTypes = new List<TrashType>();
             foreach (var can in trashcans)
             {
                 foreach (var typ in can.acceptTypes)
                 {
                     if (!generateTypes.Contains(typ))
                         generateTypes.Add(typ);
                 }
             }
             print("types " + generateTypes.Count);
     
             // GenerateTypes = 2.
     
             // Two Trash object can added to list.
     
             // Above sizeofList is Max Value list. This list is 10.     
     
             for (int M = 0; M < sizeOfList;)
             {
                 var rnd = Random.Range(0, rightObjects.Count);
                 if (generateTypes.Contains(rightObjects[rnd].GetComponent<Trash>().kind))
                 {
                     rubbish.Add(rightObjects[rnd]);
                     print(rnd);
                     M++;
                     print("Trash added list");
                 }
     
     
                 // And now i want check max value per Objects = 5!
                 // Examble 5 Metal trash and 5 Glass Trash.
                 // but how i doing it?
                 if (rubbish.Contains(rightObjects[rnd])) 
                 {
                     
     
     
                 }