Hey, I was wondering about the wastes, and what people can find/bring back from out there?

Basically, Kanaya and Aradia are going off on an expedition, is there any restriction on things they might find? As an example, if they accidentally kill a mom chocobo, can they rescue it's chicks?

Also, if you actually want to find something from their own world (not at the moment, just in general) is there an official request thing I can't find, or is it just sort of a 'dont't overdo it' thing?