mysterious memory problem
Sounds right to me 432.6 GB = 443,000 MB

The SQL Servers are consuming less than "min memory" because that is all they need.


  SQL Server is not guaranteed to allocate the amount of memory specified in min server memory. If the load on the server never requires allocating the amount of memory specified in min server memory, SQL Server will run with less memory.


That is, your working set of data does not exceed min memory and this is false:


  total of more than 2 TB worth of often accessed data.