Responsibilty of an agent under Section 409, 420, etc

Actually my uncle is broker in textile. He had executed a transaction of sales of Textile items of approx rs. 60lakhs in 2012 between saller & purchaser. Out of which approx rs.53 lakhs had been paid on the same time and remaining were pending. The purchaser had not paid it till date. Now after 5 years, One fine morning my unlce (who is broker) came to know that saller has registered FIR And in which name of my uncle is also mentioned as a party of fraud. When my uncle called saller, he told nothing to worry to you, and misguided that you just go and give statement in police, your name will be removed from FIR. And when he went there, police after taking his statement, refuses to allow him to go back to home as there were charges under section 409, 420,etc. On him. Now I just want to know as follow: 1) what procedure we should follow so that our name should remove from case? 2) Is saller legally have Right to claim his money after 5 years? 3) what if saller gives an affidavit that he knows that broker is genius and he had helped me to try to recover the amount and he has just mention his name as he was a broker in that transaction, his intentions were wrong? 4) are agents/brokers are still liable, even if brokerage/commission for the defaulted transaction has not been paid to him? 5) Is it will be in our favour to file case against the purchaser for the said transaction? 6) can we file any maanhavi claim against saller as he have to spend some days in jail.