Is there a way to authenticate an Xbox Series X without opening the box?

99% huh? So you’re saying there’s a 1% chance this is legit? Lol…jk. Thanks for your reply, Josef.

Hi and thanks for reaching Microsoft Xbox gamer's community.
My name is Josef.
I'm an Independent Advisor

Hope you're doing great today TIMM2231

Never trust on a website / a seller with a price below than the ESRP price (this applies to everything)
In the 99% of the cases you’re going to lose the money (just to not say 100%)

Always purchase your devices with authorized retailers

You’re welcome Tim!
Unfortunately it’s too good to be true

Right now the minimum price for a Halo infinite series X doesn’t go below $700 :c

Don't hesitate to reach the community forums if you need help in the future
For now take care and have a good day

Thanks for your reply. Yeah, I stumbled across the ad on YouTube and it’s from a place called Berry’s Buys haha.

This deal seems too good to be true..a Halo Infinite Edition Series X for $200?! [mod removed]

Understandably I’m suspicious so is there a way to make sure this is a legit, authentic console without opening the box?

Not that i am aware of no. Definitely sounds too good to be true though.

As the saying goes "if it sounds too good to be true than it probably is"