@Jan *****************
it comes down to whether you've updated your bank book enough times during the 2 months initial seasoning when you apply for the first year extension from the Non-O .
I always recommend at least ask for a 2-3 month detail transaction report when you go get the bank letter.
Most banks can print that on the spot and give it to you with the bank letter..
That way you have the whole transaction history in case your bank book doesn't