The Fed can directly purchase and sell treasuries and does so frequently without using offshore banking accounts.

How and where would I find totals for these transactions?  I know that they do sell them, but where do these buy/sells come from in the selling arena?  An intermediary?  I realize all changes are made through the NY trading desk, but again where do these numbers show up?

Part of it is the daily Repo and Pomo markets (google) where the FED allocates temporary of permanent funds for the primary trading banks to support the stock market and/or treasury market.
Awesome information!  I've googled it and waded through some BS to be quite frank....so I got to this table...

https://www.trading.treasurypoint.com/research/fundlist.asp

Can you help me read this, or can anyone who knows how?

PS-Anyone know why its no auto linky?

It looks like secure sites don't work with autoformat. I suppose I've never tried to link with a secure site and autoformat before.

You can always use the html "a rel="nofollow" href=link" to do it.

The link is here.