Are all of these NOS tube inventories real? How have we not consumed them already?

Thanks all. Yes I was asking about new old stock not NIB. The whole NOS moniker seems to be everywhere from 5-6 large scale retailers and many other smaller specialists. 
I was able to get what was listed as new old stock circa 1969, with measurements and a taxonomy of the screen printing on the tube that I cross verified prior to purchase, and after 4 days use it really is beginning to sound amazing. 
Ironically though, after buying what was marketed as a single item, the dealer has more... so I thought hmmm. 

I just bought a pair of NOS Mullards 12AX7 from Upscale Audio 2 weeks ago where they are rated in four diff categories and priced accordingly. Anyway, I was told you better grab this pair quick as Kevin only has 100 pair left and then that’s it!. I was like wtf? 

@dill I also agree about the Matsushita 7DJ8. Upscale is good. A little pricey, but they definitely do their due diligence with tubes. 

Tubes in the 40s, 50s and 60s were as common as transistors and all the chips of all varieties are now. Radios, TVs and just about any kind of electronic device were full of them. Radio and TV stations and many other large scale businesses used tons of them. The first computers used massive amounts of tubes. The changeover to transistors, etc. was pretty quick so there were very large numbers of them stashed all over the world. Although only a few varieties of tubes are used in audio, there are still a lot of them around.

People like us who still use tubes are a very small number. As far as tube audio gear goes there is much more of it around now then there was in the 70s and 80s. So we don’t use them up very quickly.

A smaller number of them are never used, or NOS. NIB means new in box. Whether it’s the same box the tube came in, who knows? It’s another marketing point.

Buy your tubes from reputable dealers and you’ll get what you're paying for.

Note that new tubes, or "currently manufactured tubes" for those who are seemingly confused about what NOS actually means, make up a lot of tube stock (not to be confused with "tube socks"), especially guitar and bass amps (of which I am certain use far more tubage than hifi)...making lots of room for the classic tubes of yesteryear to be used and eventually used up. I use both new (Gold Lion, KT120s, etc.) and NOS tubes because I can...people who don’t own any tube gear should still have a few tubes around simply to look at and because they will make anybody at least "seem" more interesting.