I just bought a brand new Switch tonight and it's old as dirt! I guess those inventories haven't dried up after all!
New
Serial: XAW10049xxxxxx
Serial on device matches serial on box: Yes
Region: US
Firmware: 4.0.1
Color option: Grey
Store: Gamestop
Was a bundle (if yes, which): No
Fusée Gelée...
As others have mentioned, you're wasting your time, energy, and resources in seeking out a 3.0 device. You just need unpatched boot rom (high probability you have one now.)
That article is a bit misleading. It's my understanding that:
You're not going to instantly void your warranty, at least in the US. (The burden of proof would be on Nintendo's side.) The FTC has been very active in this area lately. [1][2]
nx-hbexploit300 exploit only works on Switch OS 3.0.0.0...
Serial: XAW1001202xxxx
Serial on device matches serial on box: yes
Region: US
Firmware: 1.0
Color option: Gray
Store: Amazon (marketplace seller)
Was a bundle (if yes, which): no
Purchase date: May 31, 2017
Fusée Gelée works: yes
Serial: XAW1006192xxxx
Serial on device matches serial on box...