At the link below is a copy of the signed testimony of the three witnesses to the plates of Mormon. It is in Portuguese and the translation is below which was done using Google translate.
STATEMENT OF THREE WITNESSES FROM THE SEALED BOOK OF MORMON
By the power and mercy of our Heavenly Father and our Master and Redeemer, yes, Jesus Christ, we bear our witness to all nations.
The nature of this testimony is to briefly describe what we have seen, heard and touched:
After some time with Mauricio Berger, who told us about the events on Mount Agudo, we decided to accompany him to the mountain. We can say that everything we have seen there has an extraordinarily sacred character. The prayers and praises offered to the Lord in that place, seeking to do the will of the Father, resulted in the visit of celestial beings; the instructions received directly from the Angel Moroni, are events that have marked our lives forever and ever. We squeezed his hand and received from him the Golden Plates, the translating stones and the Sword of Laban, formerly in possession of the Prophet Joseph Smith Jr. This sublime circumstance had a powerful effect on our beliefs by enlarging our perception of this great and marvelous work.
We affirm that, by the power of God, the Sealed Book of Mormon will be translated, contained in the plates.
We know, therefore, that the translation will take place in two time periods. The first part that belongs to Maurício Berger (in fulfillment of the prophecy of 2 Nephi 27: 21-26 LDS, or even 2 Nephi 11: 143-147 RLDS), with the intention of calling His people again to repentance. Upon completion of the translation, we understand that will be fulfilled what is written in 2 Nephi 30: 3 LDS, or 2 Nephi 12:80 RLDS – where it is clear this Record will be sealed back to the Lord in accordance with Ether 4: 7 LDS or Ether 1: 101 RLDS. Qualifying your people to receive the second part.
We place our witness at the disposal of the world, with a deep sense of gratitude and a total sense of responsibility towards God who directs this work. We solemnly affirm that by our fidelity to this testimony our garments will be clean at the last day.
In vain will be the one who stands up against the work of God. Honor and glory be for ever and ever, the Father, his son Jesus Christ and the Holy Spirit, in whom we entrust the conclusion of this glorious work. Amen.
Joni Batista, Valdeci Machado, and Wagner Zeppenfeld