I thought (RE: models) that they are included in a separate jar.

yes, in aws-java-sdk-models, but apparently not all services are included https://github.com/aws/aws-sdk-java/tree/master/aws-java-sdk-models/src/main/resources/models

I have a feeling that someone (maybe original authors of boto) just scrubbed aws docs for the shapes and now there are versions here and there 🙂