I am very sure that all of the indicted cannot leave the district where they reside as per the terms and conditions of the criminal bond. Further, if they did leave the district---the judge would have to approve the movement from one district to another. Also, recall this is another state.
Therefore, it seems unlikely that any of the accused is attending horse sales and signing for horses as this would be a direct violation of their bond while their trial is pending. These are standard requirements in all federal indictments. I am not sure where any of the parties reside---but that will be the only district of which they can travel freely without a court order from the Federal Judge--this is not easy to obtain.