Lostlego.mp4.7z -

Depending on where you encountered the name, it likely refers to one of these three things:

: Many digital horror creators name their files "Lost[Something].mp4" to create a sense of found-footage mystery.

If you are looking for actual rare LEGO media, these are the authoritative platforms to use:

: Once extracted, use MediaInfo to check the video's metadata. This often reveals the original creation date and the software used to make it, which can debunk or confirm a "lost" media claim. Building instructions landing page - LEGO

: The primary database for confirmed missing films, games, and videos. Search for "LEGO" to see verified lost projects.