I understand that when there is any discrepancy, the schematic is the most reliable source for up to date answers. My gut says it's common sense to solder these into the board, but I'd rather not chance compromising any sonic integrity of these preamps.
*EDIT*
Here is the response from SCA:
> Can you please confirm if it is correct to install the 4 blue inductors
> included with rev. 3.3.1 of the N72?
Yes, as you can see from the schematic the circuit will not pass a signal without them.
Best regards,
Seventh Circle Audio