Here is the math:
61% of $3,500,000,000,000 = $2,135,000,000,000
So, as per the OP article, $2,135,000,000,000 in assets is missing.
THAT is a lot of $$$$$$$ missing in assets.
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P.S. - That 3.5 Trillion is about 1/10th the USA NAT. DEBT = $34,853,669,179,869
Source:https://www.pgpf.org/national-debt-clock?gad_source=5