It seems to me that yellow box went away some time in the '90's. There was a lot of old stock out there, as that was when everybody started cleaning rifles like benchrest guns. All the 'new' products came out about then and they were 'better' because, as MJ1 said, the nitro benzene was removed. It's also about the time that ammonia really started to get used heavily to remove copper.
My guess, early '90's.