Instruct: Classify a review into positive or negative sentiment.
Query: Think these sold by Amazon may be knock offs not Fiestaware

Ordered plum luncheon plates to go with some other colors I already have. Shape was different (flat on edges underneath) and they won't stack with other fiesta plates. Thought that was weird. Then I noticed they do not have a mark/ stamp on the back that says Fiesta like all others pieces either. It is a darker color (plum) but my other darker colores all have a stamp. I am not sure who made these sent from amazon so they are going back.