Donating Things That Don't Belong to Me...Oops

We moved into our apartment in the fabulous Montclair, NJ about 6 months ago.  This is the first time we've been in an apartment (not a house) in 6 years.  It is all part of the finishing school plan - downsizing goes along with it.  We have a great place but it is SMALL!  We sold all our big things and replaced them with little things from Ikea.  It was freeing in a way.  It quickly became clear that we still have TOO MUCH STUFF!  So, it's become a project.  I've sold many a priceless possession for far less than it's worth on Craiglist.  We've been donating things left and right; anything not nailed down ~ look out!  On Tuesday, the kids and I donated a large box of books to the library.  The box has been sitting here for over a month.  Little by little, we've added to it.  As I was handing the box over, my son grabbed a book off the top and said, "isn't this Daddy's".  It WAS Daddy's, but Daddy had told me we could donate it.  The boy insisted, "are you sure?"  Of course I was sure...what kind of person donates things that don't belong to them?  Cut to this morning, Thursday...my husband is searching all over the book shelf and around the house.  He looks forlorn.  "Have you seen my book, 'Design Patterns'?"  Why yes, yes I have.  I gave it to the library on Tuesday...the sinking feeling in my stomach left me squirming in his gaze.  He looked confused and somewhat shocked...I'm not sure if he even believed me at first.  So, I swallowed my pride and did the unthinkable...I went back to the library and told them I needed my donation back: )  I was escorted into a back room stacked on all sides with books - tables piled 30 deep - boxes on the floor - SO MANY BOOKS!  The kids and I began searching, but to no avail.  Interestingly, I didn't see any of the books we had given.  I was told to look on the sale racks where they sell the books not suitable for shelving to raise money for the library.  Not one of our books graced these shelves.  "I guess it's been sold then." she told me.  Sold for $1!  My husband's $50, almost new book that he needs for his work was sold for $1!!!!  Not to mention every single other book we donated - apparently sold, as well.  In 2 days, they sorted, shelved, and sold them all!  That's impressive.  I, on the other hand, hang my head in shame and vow to check, recheck, triple check before I get rid of something that doesn't belong to me in the future.