The report makes a note of the list of tools used by the authorities, including CoinMarketCap. It is under the section, "Audit of the Assets Forfeiture Fund and Seized Asset Deposit Fund Annual Financial Statements Fiscal Year 2019." On the thirty-third page of the report under the heading of "Financial Instruments," CoinMarketCap is mentioned as an example of "Web-based valuation tools".
The report does not give insight into whether the US government uses other similar web-based data tools, and to what extent these tools are used for. The Department of Justice did not respond to the queries whether the government was using other similar tools. The use of publically available web tools by the authorities is nothing new as they have been actively taking in the help of private blockchain monitoring and analytical tools to keep up with the evolving technology.
Cryptocurrencies being an emerging tech has come a long way, from governments planning to ban them to today outright when feds are taking in input from the same websites and tools which are used by a majority of the crypto community. Earlier, these agencies were taking data from blockchain and crypto surveillance tools to track the use of digital currencies for illicit activities.
Looking at the growing demand for digital currencies across the world and the regulatory issues surrounding it, the association of blockchain and crypto centred analytical firms and government agencies will grow further.