The paper nautilus is not really a nautilus at all! It is actually a type of octopus. This species has dramatically different looking males and females. Males and much smaller and do not have shells. So, all shells from the paper nautilus that you find belonged to a female!
MolluscaBase eds. (2022). MolluscaBase.?Argonauta argo?Linnaeus, 1758. Accessed through: World Register of Marine Species at: https://marinespecies.org/aphia.php?p=taxdetails&id=138803 on 2022-01-12