What about them?
They are just another thread added by the seller (usually sitting right above the original thread) saying sold! Although completely unnecessary IMO, some sellers do this, however, simply adding another post to the original thread stating 'sold' would be far better and all that is needed.
Either way, go to that sellers posted threads, and you'll find the original FS thread still there.
Case in point, here is the original listing from the first link you posted!
https://www.rolexforums.com/showthread.php?t=533447