Guess it depends on how FL laws require the creation and storage of records. If the Sheriff felt that the arrest was wrong or illegal, then the paperwork accompanying it would also be invalid, true?
no, it would be evidence of a bad arrest or evidence of the deputy violating a department directive not to make arrests for CCW.
what if the deputy who arrested the man Finch released lied on his report or violated the mans rights? well there's no longer any paper evidence of perjury even if someone later comes forward and says he witnessed something contradicting the deputies story.... that's a good example of how paper work of a bad arrest is still important for the public eye...
lets use a hypothetical example
say the CCWer arrested told the deputy "I do not consent to searching my jacket"
the officer searches anyway finds the guns, arrests and then puts on his report "suspect gave me consent to search jacket". that would be perjury, no prosecutor wants that officer's testimony anymore.
sheriff destroys the reports and records.
later someone who videotaped the encounter comes forward with the tape, the tape shows the man refusing consent. that deputy can be fired so no one likes a known liar. but now he can say "no he did refuse consent but I had PC/officer safety exemption/ yada yada yada" and there's no paper evidence.
I'm not saying this is what happened, or that anything remotely like this happened, this is just why I think paperwork needs to be kept and not destroyed without proper authority.