There would be vents on the outside, and you may hear noise from the fans.
Also try this page for info https://www.telecom-tariffs.co.uk/codelook.htm
What exactly is your issue?
are you currently a BT Retail customer? if so are you using your phone number or address (not post code) in the dslchecker - can you post results
you already covered this back in June 2023
If there was a copper pair cabinet that was recorded as having FTTC , but didn’t , then the volume of failed orders that resulted ( ISP’s ordering FTTC that couldn’t be supplied ) would pretty soon indicate this record ( data ) error , but more fundamentally , when FTTC is provided , it’s not a case of somebody simply ticking a box somewhere and hey presto availability is shown , there is far more to it than that , it’s a little ridiculous to think OR have went through the entire provision process of enabling a cabinet as having FTTC but not actually providing it .
It is possible to have distribution points , DP’s ( OH ) at the top of poles , in underground structures ( U , UR ) or even wall mounted ( E , External ) that are close to a copper cabinet but are not served from it , they are E/O ( exchange only ) DP’s , and they don’t route through the copper cabinet to the exchange , the addresses served from those E/O DP’s , would show no FTTC , even though near by DP’s ( and therefore nearby addresses) that are served via the cabinet would.
Post the DSL return for an address you think is showing FTTP available, could order it ( so the cabinet is not showing waiting list ) but should they order FTTC , the installation would fail , because the installer would conclude that their isn’t actually a FTTC cabinet associated with the copper cabinet.
In individual cases it’s most likely to be an addressing issues , if an ISP ( for example ) or a consumer for that matter , either gave an inaccurate address when ordering , ( entered the wrong address into the ordering portal ) …….so as an example, ‘Rose Cottage’ , there hundreds of ‘Rose Cottages’ , but say two are regularly mixed up , because the respective postcodes are ‘similar’ , AB1, 2NA , and AB2 1NA , using the wrong address would build the circuit to the wrong PCP/DP , if the installer went to the address that actually wanted service because they rang the consumer on their mobile , effectively ignoring the incorrect postcode on the job , they wouldn’t be able to complete the order , and if it happened the address was E/O , then it would be resolvable by rebuilding the order with the correct postcode
I would think for starters, the only DB that matters is Openreach's. What do you see if you enter your address here?
FTTC is described as "Superfast Fibre Broadband". If that isn't listed then it probably doesn't exist. If it says it is available but local OR say it isn't, I'd try to raise that with OR either as a complaint or via their chat service.
There's some pic of various cabs here.