Find? Return?

Bloody cat just jumped up on the sofa and started licking the butter off my muffin. Disgusting!  Cat slobber on my breakfast!  Now she looks like a dog that just ate a spoonful of peanut butter. She cannot stop licking and licking her mouth.  Hahahahaha

So, I get to the library and head to fiction and sure enough there was the book Artichoke’s Heart. I opened it up and flipped through the pages. I glanced up and around the aisles. Not a soul was watching. I tentatively reach my hand up inside the plastic sleeve and there I feel a piece of paper. It is stuck to the sleeve like it may be on a sticky note. I tugged. It came loose and I withdrew my hand. On the note neatly printed was this… find it in the return. I check the book out and head to the office.

Find it in the return? Return what? The key? The book? I have no idea. Nell shows up at the office to do a meds inventory with me and I launch into more of this mystery with her. She was with me when I found the key. She suggests we return the key in the morning and see if there is another clue at the post where we found it. 

I arrive at the park moments before Nell. We both get out and walk across the park trails about a mile to the spot where the key was at. There is nothing there. We both look around the post, at the post and nothing. She asks if I brought the note. I hand it to her. Maybe, she says slowly, you are supposed to return the book. Not at the book drop box but to a person in the library and maybe, they will have another note for you. Maybe….

I stopped by the library before hitting the office and she took the book, smiled at me and asked if I enjoyed it. Yes?.... She smiled. Do you have anything for me? No Ma’am the computer shows you returned the book. Thank you.

Well what should I return??   Bloody Hell!!! Anyone have any idea? What does this mean?