I had my backup mails on Yahoomail and now all my mails in archive are not there in the account. how to restore it? ?

I used to keep my back up of gmail account in yahoomail though i did not use yahoomail for sending any mail to others now i realise that there is no mail in my yahoomail account and only recent mails from this month are being shown. How can i get back my mails which were in yahoomail account. those mails are very important to me. 

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