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If you drill down into the earlier results for the "box standard" Ngram, that looks like a spectacular fail from their (notoriously dodgy) data set.
No idea about pushing the envelope, tho. Sounds aviation-based to me, no?
@jj72 Aye. Even there, some people say it refers to the concept of a "Flight envelope", which is the general flight characteristics of an aeroplane that might be pushed by extreme use, but there's also the fact that the cone of high-pressure air that forms around a plane approaching supersonic speed is often referred to as an envelope, which makes "pushing the envelope" a more dramatic metaphor.
itsbruce
https://books.google.com/ngrams/graph?content=%28bog+standard%29%2C%28box+standard%2Bbox+Standard%2BBox+Standard%29&case_insensitive=on&year_start=1850&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cbog%20standard%3B%2Cc0%3B.t1%3B%2C%28box%20standard%20%2B%20box%20Standard%20%2B%20Box%20Standard%29%3B%2Cc0
And for meme purposes:
https://books.google.com/ngrams/graph?content=fuck&year_start=1700&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cfuck%3B%2Cc0
Filthy eighteenth-century writers.