[research99]

There are always backup copies.

Identify the firm which created the microfilms, then ask for their master copies.

[foundedonpurpose]

what are the odds that they still exist?

[trebb]

There are always backup copies. Identify the firm which created the microfilms, then ask for their master copies.

Not likely they were overlooked in the big scheme - probably only reward is that they don't die as long as they hand over the records and shut up.