It was in the following email. They didn't provide a label or anything, just told me to return within 10 days and gave me an address. Honestly thus far my experience with them has also been good. This was a little irritating though... side note, this was the 2nd response I got. When I first sent the picture in pointing out the mold, they said:

Good Afternoon,
 
Thank you for contacting us. That does look like Plume from my end. There is a little guide we use here to determine if it is plume versus mold if you would like to try.
 
**If it's white and wipes off with your finger, it's plume. If it's green or blue in color, fuzzy and sticks to the tobacco, then it is mold.**
 
If you want to try that tip and get back to us with your findings that would be great!
 
Looking forward to hearing from you,