Как сделать обертку?

const elems = [].slice.call(document.querySelectorAll('.box'), 2, 5);
const parent = elems[0].parentNode;
const wrapper = document.createElement('div');

parent.insertBefore(wrapper, elems[0]);
wrapper.classList.add('wrapper');
wrapper.append(...elems);

const boxes = document.querySelectorAll('.box');

const isNested = (f, t, c) => c + 1 >= f && c + 1 <= t;

const insertAfter = (elem, refElem) => refElem.parentNode.insertBefore(elem, refElem.nextSibling);

const transferBoxesToWrapper = (fromIndex, toIndex, wrapper) => {
  boxes.forEach((box, i) => isNested(fromIndex, toIndex, i) && wrapper.appendChild(box));
}

const createWrapper = (fromIndex, toIndex) => {
  let wrapper = document.createElement('div');
  
  wrapper.classList.add('wrapper');
  insertAfter(wrapper, boxes[fromIndex - 1]);
  transferBoxesToWrapper(fromIndex, toIndex, wrapper);
}

createWrapper(3, 5);

let wrapper = document.createElement('div')
wrapper.className = 'wrapper'

wrapper.appendChild(document.querySelector(`.box:nth-of-type(3)`))
wrapper.appendChild(document.querySelector(`.box:nth-of-type(3)`))
wrapper.appendChild(document.querySelector(`.box:nth-of-type(3)`))

document.querySelector('.box:nth-of-type(2)').after(wrapper)