Hey there Rayjbabii,
Thanks for reaching out to Apple Support Communities. We understand you have a question about if the color of the word Series on an Apple Watch box indicates if it’s cellular or not. We’ll be happy to help with this.
This could be an indication but the best way to identify if the device is cellular or not from the box is to review the info on the bottom of the box. This will include the model number and identifier info and you can compare that with the info here:
Identify your Apple Watch
Also, if you open the box, the cellular mode will have a red ring around the Digital Crown.
We hope this helps.
Take care.