Have Laravel 5.8 count data in other fields not just unsignedInteger

Hi I am new to Laravel,

I have two database tables (boxes and items) aka a hasMany() relationship. I am trying to get laravel to display 4 results of the boxbarcode column not 5 of the box_id as you see in the screenshot.

The problem is it is looking at the box_id (1,1,1,1,1) not the boxbarcode (TRTB0001). How can I adjust my Model, Controller, View to display this? See code below.

Box.php (Model)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Box extends Model
{

    protected $guarded = [];


    public function items(){

        return $this->hasMany(Item::class);
    }

}

Item.php (Model)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Item extends Model
{

    public function company(){

        return $this->belongsTo(Company::class);
    }

}

boxesController.php (Controller)

namespace App\Http\Controllers;

use App\Box;
use Illuminate\Http\Request;

class boxesController extends Controller
{

    /**
     * Display the specified resource.
     *
     * @param  \App\Box  $box
     * @return \Illuminate\Http\Response
     */
    public function show(Box $box)
    {        
        return view('boxes.show', compact('box'));
    }


}

show.blade.php

@extends('layout')


@section('title', 'Show Box')  


@section('content')

<h1 class="title"></h1>

<p> <a href="/projects//edit">Edit Box</a></p>

<h3 class="content">Status: </h3>

<hr>

<h5 class="content">List of Box Items:</h5>

<!-- ONLY SHOW TASK <DIV> IF A TASK EXISTS -->
@if ($box->items->count())
    <div>
        @foreach ($box->items as $item)

            <div>

                <form method="POST" action="/items/">
                    @method('PATCH')
                    @csrf

                    <label class="checkbox " for="in" >

                    <input type="checkbox" name="in" onChange="this.form.submit()" >
                            

                    </label>

                </form>         

            </div>

        @endforeach

    </div>
@endif

@endsection

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