I almost threw it out thinking it was junk mail, but AFAIK its legit. And intriguing.
Do you gamble on the easy option #2 and hope for decent "average spending" or try #3 and find all those damn records.
Option #3 would take some amount of time, I just wonder if it would be worth it. I doubt I've spent > $15K over 10 years.
You only get to count Visa/MC/DC not AMEX and only foreign currency stuff, not hotels/airlines etc. booked in US$
And I was a starving student for many of those years
so probably #2 for me