Another option you might like to consider for "next time" is to get another
aircraft to take a look from underneath (preferably 2 crew; 1 being an
engineer with binoculars).

Also, in many aircraft it can be "deduced" that all 3 are down and locked if
the in-transit light is OFF (after being on whilst the gear really is in
transit). "Insert usual disclaimers here etc" - but it's another clue to
help you make the best decision.

Cheers,

CC