I guess the most important question you posed is what they do with external bug reports. The thing is, I don't know.
I thought that one of the reasons why companies release software as open source is that it instantly gives them a free user and test-base and solutions to bugs may be "donated" to their software without costing them much. So, external bug reports should get equal --if not more-- attention than internal ones. One could even consider publishing the internal bug-reports on the external bug-tracker, in the hope that it gets solved faster and cheaper than doing it themselves.

It probably also depends on whether the company still has an active team available dealing with the development and maintainance of this software.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re^3: Reporting bugs in corporate-sponsored CPAN code by CountZero
in thread Reporting bugs in corporate-sponsored CPAN code by Tanktalus

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