#1: I'd advise going forward never allowing a customer to "remove his name from the account". Joint accounts should be closed and a new account for the wife opened in only her name if such a situation is requested.
#2: In your specific situation question, I think the removal of his name from the account later is irrelevant. Take out sentence #2 and reexamine your question. The customer is requesting historical documents from when an account was open and when he was the account holder. Yes, you can give him the copies, in my humble opinion. You have no grounds to deny this, and he has every right to request it.
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"Gratitude makes sense of our past, brings peace for today, and creates a vision for tomorrow." - Melody Beattie