Identify my garage door opener.
Start with the exact motor-unit label. If that is unreadable, combine manufacturer-backed label/serial locations, brand-specific receiver or programming clues, and an old remote model while preserving an explicit unknown state when the evidence is not enough.
Build an evidence stack, not a visual guess.
Garage Opener Help ranks clues by strength: exact motor-unit label first, receiver / programming evidence second, old-remote clues third. Housing shape alone is not used to identify an opener.
Is a separate receiver box wired to the opener?
An external receiver can change which handheld remotes work without changing the ceiling opener model. Photograph the receiver label; do not identify it from case color alone.
Do you still have an old remote?
Look for the remote model or FCC-style identifier on the back. A remote can identify a receiver family, but a separate receiver may mean it does not identify the ceiling opener.