I agree -- any freshly dug plant that you think is dead, leave it in the pot for a few months and see what happens. I received a small sad looking Pleioblastus chino division that appeared to die. All top growth turned dry and brown within a couple weeks of potting it up. But I left it alone, and a month or two later it produced a few new leaves and some small shoots.
I have a Pleioblastus chino 'Murakamiansus' that has looked that way for close to two years. I'm not sure what is up with it. I supect it would do better planted in the ground, but it isn't really supposed to be cold hardy here.
Dan, it topkills but comes back strong every year here, so go ahead and plant it if you are so inclined.