No idea, there should be a manhole cover adjacent to the cabs, if they are VM thet will be stamped CATV.
If there are no Manhole covers there you could trace the trench scar back to a Manhole cover.
I think they are 2 of these:
VMSD1 – 535 W x 985 H x 315 W Distribution/Amplifier Cabinet 1 per 30 homes max.
If you really want to check them out try measuring their dimensions.
These might be used in fibre delivery areas, but not in HFC. The ones used in HFC areas are double that size.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV+), Talk Unlim Telco, VIVID 100, Virgin PAYG Mobile