Last year we got a TAX fpr, that included the vaue of used items based on their condition. It included a  print  out checklist.  I  used it as an aide to get rid of stuff in my home.  Things have to be in Good condition to use as a deduction.  Being a thrift store shopper I knew what that meant.  Sheets, blankets, everything had value.  They even sell used looking towels at the thrift store.  (I have bought them for rags so I know.  And that is - $1.00 a piece.)   A Good pair of jeans that don't fit me were worth $6.00.  And yes it sells.  A lid to a cake plate was valued at $3.00 so I gave up looing for the top and let it go.  My husband and I had consolidated down to one home. We had homes in two cities so we had a lot of good furniture and double appliances, too.  All stored in one house!  Altogether we had $10, 532 of verifiable deductions.  All I had to do was take it in and get my receipts.
We gave up toys we had saved for the grand children, and thought we would be using for the next grand child. WE decided it would be years.  As soon as we did that, the next one was born.   And books!  A good book sells for between $2.49- $10.00 at the local second hand store.  Paper backs for 25cents and up unless it is a popular new book.  Everything has to be researched and documented. It is a lot of book keeping, but we did it over time.  And yes, now we can walk through the garage.(and frankly the rest of the houe.)  This year I would like to get down further.  The extra stuff left is ore of sentimental value, and won't add up to near that much .
As a still wanna be teacher, I tutor and have loads and loads of stuff for that.  I want o organize that and get it into one good file cabinet.  There is so many things on the internet that are already organized. 

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