Proof bank accounts/credit cards

[terre]

Hello all, this is a question in preparation for an upcoming citizenship interview. I took a few trips during the 5 year period which is being considered for my application, where all were under 6 months. My parents remained in the US and I lived with them. I'm considering bringing some proof of bank accounts and credit cards. If bringing multiple statements is not possible because I don't have them or due to a relatively low activity in some of these, would some sort of letter of proof from the institution indicating I have these accounts, the date that I opened some of these, etc with my address and all be sufficient? Or would it work against me since I don't have more?

Any advice/help would be appreciated, thank you!