Have you looked at this? https://archive.org/details/roblox-client-archive, it was uploaded by David Baszucki.
Lol not even close, David is just listed as the creator.
Also, the client has 2021 and 2017 modification dates in the textures folder. Either it's modified 2007 or 2008.
And BEFORE I hear about the DLLS having 2006 modification dates, that doesn't mean nothing when everything else is 2021. If a game had all of it's DLLs from 2002, but the game data was 2022, was the game developed as early as 2002, or is it really a 2022 game?