SFTP troubleshooting bad client public key in pcap

Is there a way to determine a bad public key presented to an SFTP server configured for public key authentication? I am comparing two pcap files next to each other one is a success and the other I know is failure with client presenting wrong key for public key authentication attempt. They look very similar except the successfull connection obviously has more encrypted packets back/forth. Is there any tell tail sign of a wrong client certificate presented like an ssl session? In the SSL session we can see an unecnrypted "Bad Cert" message. I can't find a similar one in an SSH/SFTP session captured.