also, i don't think some of these countries who already owned bitcoin will disclose their holdings to the public. i believe, we have more than El Salvador who is buying btc for their stash. and this is the reason why the OP has only El Salvador in his list so far. do you think these countries will publicly announce their crypto holdings? right now, i don't think so.
Right now, it's not possible for many countries to announce about this but as we have few countries openly announces and doing some soft policies about bitcoin and crypto hopefully in near future we will have some good news about this and many countries openly able to have bitcoin in reserve like Gold.
I'm almost sure the governments of different countries have a lot of bitcoins in reserve. I mean, central banks have private keys of many addresses
filled with BTC coins to overflowing.
Law enforcement representatives are obliged to publish only the amount of coins
seized from criminals. Typically, this number is not huge, so my guess is that governments additionally buy BTC coins on cryptocurrency exchanges or OTC markets using the accounts of individuals they trust.
To be honest, I doubt governments will ever openly disclose the
true amount of coins they own due to the pseudo-anonymous nature of Bitcoin. I envision that these funds will be treated as an emergency reserve that can be spend to securely transfer funds during hard times.
@OP, This is a good initiative to build a list of countries that own Bitcoin. Perhaps
not only El Salvador will soon announce its investment in cryptocurrencies.