I had the receipt, a separate piece of paper that they printed with my “name and info”, the email, and the text. Luckily I’d also forseen this happening and spoke to the manager when buying the phone, so I had him ready to name drop and he’d put in the notes that I’d “lost my ID” and wouldn’t have it for pickup so the guy couldn’t really argue with me for long. I did get some pushback initially though, I was a little stressed that they were trying to scam me out of my money but I played it cool.