int GetNumItems(object oInventory);

void main()
{
    object oBox = OBJECT_SELF;

    // Test for containers
    if ( GetInventoryDisturbType() == INVENTORY_DISTURB_TYPE_ADDED )
    {
       object oItem = GetInventoryDisturbItem();
       object oOwner = GetLastDisturbed();

       if ( GetHasInventory( oItem ) )
       {
          AssignCommand(oOwner, ActionTakeItem( oItem, oBox));
          SendMessageToPC( oOwner, "You cannot place a container in the chest" );
          return;
       }
    }

    if(GetLocalInt(oBox, "MAX_NUM_ITEMS") > 0)
    {
        string sOwner = GetLocalString(oBox, "OWNER");
        int iMaxNumItems = GetLocalInt(oBox, "MAX_NUM_ITEMS");
        int iNumItems = GetNumItems(oBox);

        if(iNumItems > iMaxNumItems)
        {
            object oItem = GetInventoryDisturbItem();
            object oOwner = GetLastDisturbed();

            AssignCommand(oOwner, ActionTakeItem(oItem, oBox));
            SendMessageToPC(oOwner, "The container is full");
        }
    }
}

int GetNumItems(object oInventory)
{
    object oItem = GetFirstItemInInventory(oInventory);
    int n = 0;

    while(GetIsObjectValid(oItem))
    {
        n = n+1;
        oItem = GetNextItemInInventory(oInventory);
    }
    return n;
}