As much as I love the Internet Archive, I think Lawful Masses summed it up when he said they were pretty screwed: https://youtu.be/HUx2mbBhjI8
The issue is that there is a lot of copyrighted material on there, and the IA doesn't have any mechanism for users to flag it as being e.g. a book that should be part of the lending system. So when a user uploads music, it instantly goes public and can be downloaded by anyone, an unlimited number of times.
You can send the item to the IA for them to scan/rip, but there is a backlog of several years. And you probably aren't getting your item back.
I don't know why they don't just add a "make this lendable" button to their upload form. It may be because the code is a complete mess - it's closed source and I get the impression a nightmare to work on, because they won't let anyone help with it.