Answer:
You should definitely familiarize yourself with FDIC regulations part 328, especially Section 328.3. This section covers requirements and exemptions from inclusion of the official advertising statement "Member FDIC". As to your questions about the security envelopes, I'm not aware of anything from a federal regulatory standpoint that would stipulate when you must use them. I think that needs to be part of your consumer privacy and information security risk assessment process and used accordingly.
First published on BankersOnline.com 10/13/08