Any chance someone can tell me which are these two big input caps and those 2 little between them?
I see. Hard to say, I mean they look like the stacked film type but they could be anything. If I had to guess based on this appears to be a cheap chinesium thing, they're regular poly caps epoxied into a big can to look expensive.
You can't tell without a schematic or tracing the board to produce one. Big ones could be coupling. Then again, could be something else.
A cap provides a function that can be used in many places in a circuit.
BTW This type of cap is at least 40 years old. Polyester film caps. Used wherever a, well, cap, is needed ;-)
Someone found a NOS stash.