Purging missing interfaces

We finished yesterday the migration of a Plone site from 4.2.5 to but in the process we found some broken interfaces in the ZODB, including a plone.app.kss one, which was frustrating.

As a workaround I have installed the old packages on the project again, but I want to get rid of the issue.

Anybody here has tested/used Products.PurgeMissingObjectInterfaces?

It is safe to use it?m Does it works with Plone 4.3?

Where is it's code stored?

Best regards