-------------------Mr Warren Caster buys two rifles 11/20: one a present for his son, the other for himself (a Mauser)
-------------------Mr Oswald sees Mr Caster's Mauser in the hands of Mr Truly (again, 11/20)
-------------------A Mauser is found on the sixth floor shortly after the assassination
-------------------Mr Oswald in custody is shown this Mauser and asked 'Have you seen this rifle before?'........... He answers (truthfully) "I saw a Mauser just like this in the hands of my boss Mr Truly two days ago"
The above sequence of events does not require Mr Caster to have been anything other than wholly innocent of any involvement in the assassination. The significance of this document-----------

-----------lies elsewhere: it offers indirect confirmation that a Mauser rifle really was found on the sixth floor. Deputy Constable Weitzman & Deputy Sheriff Boone did NOT hallucinate it.
How exactly would Caster be wholly innocent in this fantasy? He confirms that he took his rifles home and they were never brought back to the TSBD.
Mr. BALL. What did you do with the guns after that?
Mr. CASTER. I put them back in the carton and carried them up to my office.
Mr. BALL. And what did you do with them after that?
Mr. CASTER. I left at the end of the working day, oh, around 4 o'clock and took the guns in the cartons and carried them and put them in my car and carried them home.
Mr. BALL. Did you ever have them back in the Texas School Book Depository Building thereafter?
Mr. CASTER.
They have never been back to the Texas School Book Depository Building since then.Mr. BALL. Where were those guns on November 22, 1963?
Mr. CASTER. The guns were in my home, 3338 Merrell Road.