THOUSANDS is not a handful
According to the National Archives, 520 documents remain under seal under one of two provisions of the 1992 law. Some were sealed by a federal court and can only be unsealed by a judge. Others involve tax records. Of the 15,834 released only in redacted form, “most are currently less redacted than prior to October 26, 2017.”
Compared to the vast quantity that were categorized as JFK records and have already been released, it is. Besides, I don't know that there are thousands.