Can I claim in 2019 a 2017 casualty previously claimed, due to not getting paid by the insurance?

[LudwigVan_fan]

Can you be a little more specific with your question?  I'm guessing that you claimed a casualty loss in 2017 and reduced the amount by expected insurance proceeds...and that you never received and will not receive the insurance proceeds?   If my assumption is correct, no, you wouldn't claim anything in 2019.  You would amend 2017 and increase the amount of the casualty loss claimed by reducing the amount of insurance proceeds you didn't receive and won't receive.  If my assumption of your question is incorrect, please restate your question.