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-- He has lost his key. (PP)

   (He doesn't have his key now.) 

10 mins later:

Now Tom has found his key. He has it now.

-- Has he lost his key ? (PP)

-- No, he hasn't. He has found it. 

--Did he lose his key? (Past Simple)

-- Yes, he did.

He lost his key (Past Simple), but now he has found it. (PP)

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