Traders body CAITon Friday claimed that goods worth Rs 6 lakh crore may become redundant if the last date for using MRP-labelled old stock is not extended beyond September 30. It said with implementation of the Goods and Services Tax (GST) in July, it was provided that stocks as on June 30 having mandatory MRP labeling could be sold only up to September 30 by pasting new MRP stickers and from October 1, packed goods having new printed MRP could be sold only.