Why NVIDIA, why.

I text chatted with NVIDIA support the other day about problems I've been having with my GTX 980. After talking for about 20 minutes trying to troubleshoot, they finally came to the conclusion that my graphics card is defective. They told me that they don't know if they could replace a reference graphics card, and they'd get back to me within 24 hours if they could. About 4 days later they got back to me and said that they could try... Try? So I gave them my shipping information and all the required information, but I couldn't answer one thing. My grandparent who I was with when I bought this card held onto the receipt (I don't know how to keep track of things) and she passed away on Saturday. Unfortunately they need the purchase date and a picture copy of the receipt when I told them multiple times that I couldn't provide that information because her house is under wraps and they won't let anyone enter or remove any "evidence" from her house. What the hell am I supposed to do about this?