It's too early for me to tell what I have lost. I have a lot that aren't showing any signs of life yet, but with the warmer temps this week I am starting to see some greening up. I am going to keep crossing my fingers and hoping.
It does look like I have had a lot of loss in my iris beds though. Most of these were several years old.
I won't ask for any replacements. I often push zones and this winter was amazingly frigid. That is no ones fault, neither mine nor the seller.
The big box stores I believe have an automatic replacement guarantee within 1 year. That is an advantage when purchasing from them
