Solution: Get rid of the graveyard! There is absolutely no reason that I can think of to even need a graveyard at vB.org - or rather the graveyard with undownloadable modifications. And like Paul said earlier -
"JFYI, excluding security issues, almost all GY mods are either due to author request, or because they no longer have files attached." - Perhaps the threads can remain closed and in the graveyard for obvious purposes: there's a security risk, the author requested the thread closed, etc... BUT the archives & files can remain downloadable. That solves the issue of the vB.org Staff spending a minute and a half extracting the txt file (if there is even a text file to extract), solves the issue of if there isn't a text file to extract, one can still locate the extra files uploaded, and solves a realm of other issues.
The idea here is that if there is an exploit or security risk found - then the vB.org Member who has installed the modification can take the opportunity to remove the offending hack

And as it is - only .org members are allowed download priviledges anyway... I see no reason to make archives no longer undownloadable at all.
Jacquii.