I'm curious if anyone has seen any datasets collected from ALPRs? I would assume the actual plate number is hashed or otherwise anonymized, I'm just interested in exploring the data from a privacy point of view.

Why would you assume that they would be hashed or otherwise anonymized?

Doing so would be work, and the people with those databases have no problem with keeping millions upon millions of records, ad infinitum.

Hashing them or anonymizing them would make them much less useful to them in the future.

I would assume that if any such data set was made public that it would be anonymized.