u/AlphaXZer0

So I work at The UPS Store. I made a mistake at work recently by not charging someone a box that their item was supposed to go in before it was returned. This was an Amazon return. Affixed to the box they had a piece of paper that had their name address and phone number followed by a barcode that was from Amazon. It wasn’t a shipping label, but I thought it would suffice as one. After the customer leaves, my manager tells me that because they didn’t have the original shipping label that Amazon fixed to their package when they received it that the item was supposed to go into a box that it didn’t go into and so I had to end up paying for the box out-of-pocket which came to about $65. Is this legal for him to do? Would that not just be a business expense?