So my disk is only one file, and so is each snapshot.
Okay then you're using MonolithicSparse disks...
This naming convention makes it difficult for me to determine which snapshot 000002 is, and which is 000007. Perhaps looking at the date modified is the best option, although it is cumbersome.
You should be able to see a what each Snapshot is called and its name/number in the .vmsd file.