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They wouldn't be in the cloud by default - as you mentioned, Yahoo would have permanently deleted them by now.
Have you already checked your trash folder, though? They are usually kept in the trash folder for a period from 7-30 days before being deleted from there. If they were moved to the trash, they may actually still be there. If they are not in the trash, however, then they are gone for good. The only chance of them being somewhere else would be if you put them there. Like if you had backed them up at some point. But when they are manually deleted, there's no way to save them. Sorry.