OP says "now what?"
The answer is simple. Wait.
I have no idea why or whether Marriott would bother to retain data for the length of time OP expects to be available instantly or why it would train customer service agents in what programs were called a generation ago.
Marriott may or may not have the capacity to research this and if it has the capacity, it may or may not bother. But, if it does and unless the information pops up quickly, this could be a months, not days, process.