I used to assemble products and when someone came in for a pickup we always asked for a receipt as it was the easiest way to find what belonged to them. If they didn't have it we'd just need to look it up on the computer, no big deal

I was about 16 or 17 and guy comes in and says, "I'm here to pick up my X". I asked for the receipt. He instantly blew a gasket "I'm no thief, don't you dare accuse me of stealing, blah blah". When he settled down I said I only wanted it to find his item easier, which of course started him on another shouting rampage. I was the only one in the department and I remember him shouting a lot and then had his finger right in my face. It was my turn to lose it, I told him if he didn't get his finger out of my face and stop shouting I was going to kick seven shades of shite out of him. The commotion had caused other staff members to show up, then the manager came up. I told the manager I wasn't serving him, find someone else, theres more chance of me breaking his nose than me getting his shit. I explained what happened out in the back store and the manager said it was fine, I heard nothing more about it

I had another customer lose it at me in the same place as he said good were faulty. I said no you broke it. He said it just happened. I laughed at him. He lost his mind. I didn't GAF when I was that age. Manager replaced his product FOC. I laughed at the manager about that too