The sequences are grouped - expanding them will show the files. The naming matrix is as follows:
cache.<START FRAME>-<END FRAME><padding>.bgeo.sc
The padding section is marked either by "#" or by "@". Single "@" stands for padding of 1 - so "@@@" marks padding of 3. Padding of 4 or more is marked with "#":
cache.1-9@.bgeo.sc
cache.5-15@@.bgeo.sc
cache.100-200@@@.bgeo.sc
cache.1200-4500#.bgeosc