No.
As I said earlier, if one finishes a Bun Burner GOLD, one has by definition completed a Saddlesore 1000 and a Bun Burner 1500. And you can't finish 2000 miles in 48 hours without necessarily completing at least one Saddlesore 1000. There are probably a few combinations of those rides that would qualify for nesting (e.g., the Saddlesore 1000 and the Bun Burner 1500, the Bun Burner 1500 and the Saddlesore 2000), but we would not issue certificates for all of them on the same ride. In other words, why would we issue you a certificate for completing 1,000 miles in 24 hours and another certificate for completing 1,500 miles in the same 24 hours?
Also, one needs to be an IBA member prior to attempting a Bun Burner GOLD. Just mentioning it if that is the case here.
Ira Agins
Iron Butt Association