I think he would decide that it was irreplaceable - the memory is flawed, and would taint a replacement, in just the way that the set itself would not have done if one of the pieces had not been genuine - remember the discussion they had about that? So the memeory of the old chess set would stand, and if they liked a different one later, on its own merits, he would get that - but never as a replacement item. I don't know if I have put that clearly enough.