^ I confirm this. I just saw it right now and went to try for it and I did the quest and I did recieve another coupon. Would it be like a secret quest? 'Cause it's weird that even on the official site there is no info about this one though it says : Location - Desert Beach + Chickensaurus's Shelter.
I just hope this type of quest didn't happen on the Play one 'cause that way I wouldn't have completed all the seasons as I wanted to