For context: I have a poetry chapbook which has been published by a small publisher. The book is sold through their website and through Amazon. Unfortunately, my publisher is not very communicative and I have several friends who ordered my book from them and haven't received it. I'm wondering if the book is print-on-demand (which means folks can pretty reliably order it from Amazon) or if the publisher is supplying Amazon with copies (which means it is unreliable).
Is there a way to figure out if a book is print-on-demand or not when sold on Amazon?