What happens if I forgot to but a 2d box content barcode on box before sending?

Title says it all. My first shipment went in without a 2d barcode on the box. I got confused and assumed the barcode that printed off with the shipping label was the box content barcode, and tbh I’m still not sure that it wasn’t the box content barcode. I am listing with turbolister and when it prints off the 2d barcode its a giant QR code. Does this sound correct?

So I guess part 2 to my question is this…should each box have 3 labels on it? 1 QR for box content, 1 UPS shipping label, and one more traditional looking amazon barcode (the one that prints off with the shipping label?)

If it matters… it was used books. About 75 books split into 2 boxes