It's a common symptom of OCD; it's called hoarding. I think my dad has this problem! He won't throw ANY receipts away, even if it's just for milk and bread at the store. I know that is'nt exactly what you're going through, just thought I'd throw that in there, lol.
Type in "hoarding & OCD" on a search engine, I'm sure you'll find some info.
Good luck
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Shannon
garbage policing 
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