Further examination of the documents by the Smoking Gun reportedly showed that — in addition to numerous spelling and grammatical errors as well as deviation from standard language and acronyms used by the FBI — they were created on a typewriter and that, in some instances, it's clear that some of the letters were manually typed over existing letters. A former FBI supervisor told the Smoking Gun that the bureaus' agents stopped using typewriters 30 years ago. The purported FBI documents and court filings by Sabatino also reportedly have a number of similarities, including similar misspellings of words such as "makeing" and durring."