I need help with this this scenario :

The inquirer mediated a dispute during which he concluded that one party had received insurance payouts totaling $19,000 for damage to a piano that he had purchased for $1,000. The mediator believes that this party has engaged in insurance fraud and asks whether he may report the insurance fraud to authorities or whether he is obligated not to report it. The inquirer continues, "This is a moral dilemma in which I have a personal desire to see justice done, but feel a greater responsibility to my word."

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Let's assume that the owner of the piano (party "OP" for reference) had bought the piano 20 years prior to the first claim payout. Also, let us assume that the piano is 80 years old. If it were to go to an appraiser, the piano could fetch at auction $25,000-$30,000. Lastly, let us also assume the conflict to be mediated was for asset division between party "OP" and his partner of 25 years; all other assets have been divided. The only item left to resolve is the piano, which party "OP" would like to keep for it as it has sentimental value.

How does the evaluative style of mediation best fit this scenario?

How is the subject matter is defined through evaluative style mediation is it only the piano or is there a relationship at stake?.

What is the post-relationship dynamic of the disputants based upon evaluative mediation style. Is evaluative style of mediation more suited to explore post-relationship dynamics between party "OP" and his partner?

Why would the other two forms of mediation would not be as effective to resolve this dispute.