I'm really sorry to hear that, Rob - and anyone else who has experienced losses.
I thought that I had lost 'Got Milk' (a gift plant from last year), but I finally found the rhizome and it may be hanging in there. (I'll have to spray it and the other irises against the rabbits, though.)
One thing that I am experiencing with those few irises that actually made it into the ground, is that they seem to be sinking down. I planted all of them so that part of the rhizome was above the soil level, but now, in many cases, they are covered with dirt. That makes me concerned - will I need to excavate all of these?