Hmm, not sure if that's adequate, civil court is usually balance, and that's because it doesn't deprive someone of their liberty. Criminal court is beyond a reasonable doubt, because of the seriousness of the consequences
The "balance of evidence" may say that he once had it, since he did seem to admit it when he agreed to turn it over, but what then? What evidence is there that he's now lying?
Do not make me laugh. What evidence? Persons can and do forget most obvious things.