Sands do not drop in ST.

From Live Letter XV

Q: What's the drop rate for the unidentified Allagan tomestone, the sands of time, and oil of time?
A: As I mentioned during the previous Letter from the Producer LIVE, they will not all be dropping at the same time. We'll add them gradually as we progress through patches. We're planning to have unidentified Allagan tomestones drop first, and the drop rate will be about 30%. We'll be making adjustments based on the clear rate of the Second Coil of Bahamut and everyone's average item level.



They'll be added in the future, but should not be there yet. I'm also not sure on as to how they'll introduce them based on second coil of bahamut progression. As whilst on some servers there are dozens of groups which have SCoB on farm mode. There's other servers on which T8 is barely downed.