Cloud Connectivity

If credentials for Apple ID account revealed by the seller for refurbished mac like Apple ID and its password , the secondary authentication account details ( three answers for respective questions , date of birth , rescue mail address and its own password ) and the seller followed the exact steps What to do before you sell, give away, or trade in your Mac - Apple Support ( the Mac OS was erased properly and once again you reinstall Mac OS with same Apple ID account credentials ) , the files can be shared between two Macs when signed in with same Apple ID and password on the same network Set up file sharing on Mac - Apple Support

Sync content between your Mac and iPhone or iPad - Apple Support ( this article will work when two Mac are connected with same Apple ID and password on the same network , the network connection should be of your internet service provider most probably it should be broad band connection ) , if this is used isp don't provide network to network connection .