Here is the order of progression.
1. I bought the Sinister Hollowjack Items furnishing pack
2. I placed the Witches Festival Scarecrow in Proudspire Manor
3. After the Holloween event, I tried to remove the Witches Festival Scarecrow. I placed it into my inventory.
4. The crow sounds from the Witches Festival Scarecrow were still audible everywhere in Proudspire Manor.
5. I thought getting it out of my inventory might eliminate the sounds. So I placed it in Antiquarian's Alpine Gallery.
6. The crow sounds from Witches Festival Scarecrow remained audible everywhere in Proudspire Manor.
7. I tried placing Witches Festival Scarecrow in a house outside of the Western Skyrim Zone.
8. The crow sounds from Witches Festival Scarecrow remained audible everywhere in Proudspire Manor.
9. EITHER: I tried placing the item in yet another non-Western Skyrim zone house, or I destroyed the item. I don't remember which.
10. The crow sounds from the Witches Festival Scarecrow remains audible everywhere within Proudspire Manor.
I would appreciate help on this matter. It is detracting hugely from my gameplay experience. Proudspire is the main house I enjoy working on, and has been ever since I acquired it.