Scenario:

Customer makes a $5,000.00 cash deposit on day 1. Same customer comes back on day 2 and makes another $5,000.00 cash deposit to the same account, then immediately purchases a cashier's check for $10,000.00 with a withdrawal ticket from the account. It's pretty evident that both days' deposits were to fund the purchase of the cashier's check. (A SAR investigation for apparent structuring has already been opened.)

I know I need an MI log entry for the cash purchase on Day 2. My question is should I include the Day 1 deposit on my log entry or do I only look at the cash on the actual date of purchase for the MI log entry?

I think this can be done either way; .. so a note referencing the prior day's activity is fine.
All the information will be on the SAR.

Who was the check payable too and what was it used for?

Your recordkeeping requirements end with the $5,000 deposited on the same day. Anything else that you do would not be turned over if the MI records were requested.

The check was payable to a title company and I am assuming used for a real estate purchase. Still digging that up for my SAR determination on the structuring.

So, as far as record keeping, I would treat the MI purchase like a CTR, ie just look at each day separately.

Thanks.