During 1862 standard procedure was to parole captured soldiers and transport them to a rendezvous for prisoner-of-war exchange. Johnson's records support that chain of events. 'June 1' is a transcription error. It should read simply June 1862, no date specified.
M382 is an index which contains images of service file index cards for Confederate soldiers serving in Virginia units. It states name, rank, company and regiment only.
Hospital records show that on Jan. 2, 1862, Johnson was admitted at Charlottesville VA with rheumatism. He was released and sent back to duty on March 10, 1862, just in time to participate in the famed Valley Campaign. Military service records rarely include more detail. As a general rule, nurses (usually men who might not be able to read and write) didn't have instructions to keep day-to-day notes about each patient under their care. Hospitals were always understaffed and record-keeping duties were less urgent than care-taking activities.
Wish I had the same kind of records for my father's service in WWII as you have available in Johnson's Confederate CSR! I guess it's all a matter of perspective.