How do I know if I purchased an audiobook? It’s not in my library but I used my thumb print and another form of ID?

How do I know if I purchased an audiobook? I used my Apple ID but it is not showing up in my library. I think I bought 3 books and at first it was showing that the first was read and I was unable to go into it. If I haven’t bought them then perfect I will go back to square 1 and start again but I don’t want to be charged 2x