In regards to my ERB, how do I retrieve all my information from the Reserves to Active Duty?

Have you checked your OMPF? If your S1 was worth a damn they should have uploaded most, if not all, of your documents to your OMPF.

It won’t automatically transfer since the HR systems are different. Take any and all documents you have to your S-1. They should also be able to see your iPERMS in case you miss something.

Take all your documents to S-1 and start getting it all uploaded and updated.