My short post was just provocative of the natural (suspicious), but unsupported and not even necessarily likely event they would conveniently find the half which preserves more Republicans than Democrats. Besides, in order to even view the actual data--one would have to have or sign-up for access to the New York Times...
The answer:
The lost microfilmed voter registration files records contain Social Security numbers, addresses and other personal information from 1989 to 1998.
Denver Election Commission staff searched its former building late Friday and found 87,000 of the missing records in a plastic box. They were records for voters for the years 1996 and 1997, and parts of 1995 and 1998, commission spokesman Alton Dillard said Monday.
Still missing are registration records for 1989-1994, and parts of 1995 and 1998.
...
Dillard has recommended people who registered to vote in Denver between 1989 and 1998 file a fraud alert with credit agencies as a precaution.
Of course, there aren't any statistics about the party affiliations of the missing voters, though, again, there's no evidence of any partisan wrongdoing in this misplacement(?) of voter registrations.
It also doesn't even suggest that this means that they don't still have all the registrations--just that someone else may have a big chunk of it too, and it could be used criminally to steal identities. A big problem now--when just a decade or two ago "who would have thunk it".