I am amazed that they were OK after a week in the post. Who did you buy them from? Had they packed them differently knowing the problems at the moment?
I bought some PSB plug plants from T&M and they arrived dead after a similar time in the post. The small amount of soil in the mini plugs had completely dried out. I want to buy some more but unless they pack them differently I cannot see them arriving in anything but the same condition 
Your plug plants should recover completely.
I bought them from Simpson's Seeds. I used them as my late father ordered plug tomato plants from them when seed sowing became a bit much and he always said they were good. I was lucky to get an order in before they sold out.
I have used them for seeds in the past, they have a very good range of tomato and pepper seeds. I used to order garlic from them until they stopped doing it. I think they were packed in their standard packaging, which is the root ball in a netting type arrangement and each plant laid out in its own little section in the small plastic package.
The roots were still moist when I unpacked them, but the stems were quite wonky and bent over, some at right angles.
Anyway, the smallest chilli is now pointing in the right direction. I reckon the bigger ones will follow suit.
