Do I need to submit any attachments if filing in West Virginia as a nonresident?

We moved out of West Virginia in December 2023.  My wife is receiving a government pension and in January 2024 the pension administration inadvertently withheld state taxes from her annuity.  It was fixed the following month.  Now I need to file a West Virginia tax return to get that amount back.  I was told to file as a nonresident.  What,, if any, documents do I need to submit with my tax return?