It's gonna shave just like every other modern Tech. What's special about yours ... well, you know.
I'm ALL about using NOS razors if they're in a case, but in a brand new sealed package? That's just a cool piece of memorabilia. Leave it, buy another Tech for $10, and shave with it.
Some observations:
-The 'future value' thing is a weak argument. I doubt a Tech will be worth $200 in 20 years. In the past 40 years they've probably become worth less than their inflation-adjusted sale price. Even if it did, that's $10/year before inflation--not enough to justify mothballing a razor you'd rather use.
-Looking at Completed Listings on eBay, it looks like you paid pretty good chunk of change for that razor. Opening it will make it any other low-buck Tech. You'd be way better off financially to sell it to someone who'd rather have a BNIB razor (I'd love to have it, but too rich for me) and buy another Tech.
-True to the YMMV mantra, you may want to try out a Tech before you sink effort and money into finding a birth year one. I find it to be a rather poor shaver.
A Tech wouldn't be my choice to keep as a collection piece, but since you have one unopened, I would leave it that way. Techs are plentiful and you can get a different one for fairly cheap if you want one to shave with. I use my vintage razors, but if I had one unopened, I wouldn't.
....... I put in a offer on a auction for a SA tech....
South American?
Not for nothing Jim but I still remember your advice and took it when it came to using barbacide on my vintage Rhodium and gold and it turned out fine so yeah your opinion counts to me.