Keep all defective items .....
It will come in my work.
It will come to my work.
Which of the two or something else is suitable in this context?
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To say what you are trying to say, I don’t think you should use a prepositional phrase at all. Based on your comments, I would recommend something more along these lines:
Save all the defective items, because I’ll be able to use them later.
Don’t throw away the defects; I can put them to good use.
Some key points that might be helpful:
On keep vs. save - Using keep makes it sound like you are asking the person to keep these items for their own use. Using save makes it more clear that they are not necessarily keeping the items to use themselves.
On defects vs. defective items - There is nothing wrong with defective items, but sometimes the plural noun defects is used as a shorter alternative.
On work vs. use - I think work is a difficult word to understand in this context. It’s too vague. I had a hard time even guessing at a meaning for your original sentence.
On them vs. it - Since you are talking about more than one defective item, you should use a plural pronoun. (You could use it there was only one defective item: Save that defective item; I’ll be able to use it later.