Once you sign up for Breeze Enrichment, you can see your credits being used and if you look at each individual record, you can see which properties were updated.
However, you cannot pull any kind of mass report on all the contacts who have been enriched, or what the original data was and what it was changed to by Breeze.
This missing feature makes it difficult to evaluate the success and performance of the Breeze tool, and, given that it does cost extra, all users should have the ability to properly audit it.