GST reversal on cheese

Hi,

1)Cheese is my raw material. I have written off the cheese which are expired. Do I need to reverse the GST since it is not Lost,stolen. And if yes under which section

2) I used cheese into my final good but that final good is lost,stolen then should I reverse the GST(my contention is we should not reverse GST as raw material is USED in the final goods which could be called in furtherance of business)

Request suggestions under both the scenario