William James Vahey killed himself in Minnesota last month.
His suicide came two days after a federal judge said authorities could search one of Vahey's thumb drives.
It contained images of at least 90 victims, dating back to 2008.
The boys appeared to be between 12 and 14 years old and were asleep or unconscious.
Vahey told the FBI he had been molesting boys his entire life and gave them sleeping pills before molesting them.
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