The long of it is, Hoffman was selling forged and stolen documents. He had access to the LDS church vaults, which are in a granite mountain in Utah. It is believed he stole authentic, original documents, from this archive, and sold them back to the Mormon church. He also forged numerous documents. The more sensational “historic” documents LDS leaders took a strong interest in these. They used them from about 1980 to 1985, in their own publications that church members read, to point out the truthfulness of Mormonism.
The last set of documents that Hoffman said he had, and was selling, he called the McClellen papers. He claimed it was several volumes of documents, written by a man named McClellen, that refuted Smith’s claims, entirely. He had arranged to sell them to Gordon B Hinckley, who at the time was a high ranking church leader, and later the Mormon president, and “prophet”. Hoffman didn’t have these papers, in all of his scheming and forgeries he had developed a ponzi scheme, where he would take money from various individuals, with promises of delivering very rare documents or books. He would then use the money to pay another person who he had purchased very rare documents and books from. He was also spending a lot of his illicitly gained money on a house, cars, etc.
With the McClellen papers, that didn’t exist, he had convinced LDS church leaders to pay a couple of hundred thousand for them. He claims their interest was to obtain them, in order to tuck them in a vault somewhere, never to be seen, because of their faith-demoting nature.
His ponzi scheme had caught up with him though. He owed hundreds of thousands of dollars, he didn’t have the time or resources to produce the volume of forgeries that he was selling, so he decided a “good” diversion to all his scheming was to deliver bombs to a few individuals. It is believed he was in the process of placing a bomb that would kill or hurt a Mormon general authority, when he caused the bomb he had prepared to go off in his own car. It was just one block from Mormon temple square in SLC. Scary times, the guy was a freak.
So two years later, in 1987, the LDS church released a statement saying they knew Hoffman’s forgeries were forgeries, and they had purchased them with the intent to verify their authenticity.
Never mind the references made in LDS church publications to these documents, put forth as evidence for the truthfulness of Mormonism. They knew all along! The online material, of the original printed material, has the references to these documents removed.