Young couple goes on van tour of US, boy comes back with van - no girl

Tony in Brandon said

Ok, forgive me if I missed it, but have there been ANY actual confirmed sightings of Brian in Florida, by anyone but his parents? How do we actually know he came back to Florida in the van? Did I miss that anywhere that he was actually seen in Florida???

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Police have used phrasing that indicates they believe it is factual that he returned to Florida in the van. We know that the van is there.

For the van to have returned by some other person introduces an accomplice/accessory that joined in Wyoming or somewhere in between - and that hasn't matched any story to date. But it isn't clear from what I can tell exactly why police believe he was in Florida (e.g. if it's based purely on the family's story or if there was independent confirmation/sighting).