Without touching the coins you can use the Verify feature on Titan's website. On the balance page it will tell you if it's a private key coin or not. If you redeem the coin of course the code inside the secure seal of a 2FA coin will be a short decryption key instead of the actual private key itself. Hope this clarifies.

I think an easy way for Titan to remove people's concern regarindg 2FA coins is to convert them to private key coins, simply by publishing or emailing coin owners the corresponding encrypted private keys of their 2FA coins. Assuming the private keys were protected by standard symmetric encryption such as AES256 coin owners should be able to decrypt the private key themselves using the code inside the secure seal. I hope Tim reads this post and gives it a consideration.