Again......where are the gold plates, and why were they taken away?
A legitimate question.
A legitimate answer. When the translation was finished, the angel said he would take the plates back to keep them safe. The reason for this was not only to protect the plates but to protect Joseph from the endless attempts to steal the plates. It's also funny how people who say Joseph was a false prophet were the very ones breaking in to his home and raiding his wagons searching for the plates. Obviously they believed he had them.
The other reason the plates were taken back was to "try the faith of my people" as God told Joseph. Living an acceptable life before God means demonstrating your faith in him along with adherance to his commandments. If we got shown everything and were forced to believe everything in scriptures there would be no trial of faith. Everything would be too easy and we wouldn't learn anything spiritually. We would learn a lot secularly but that is not the whole purpose in life. You have to grow in both ways.
The plates will be made available for all to see in God's own due time and there will be a lot of disappointed and ashamed people who mocked us and persecuted us throughout the ages.