State tax filing

So, I have proceeded with filing my NY return according to the helpful discussion in this thread. Btw, TT made me mail a hard copy - it seems NYS won't accept electronic filing if wages allocated to NYS are set to 0. I will keep you posted on progress.

 

Now, re asking employer to generate a letter: what information should this letter ideally contain?
Obviously, (1) statement that I haven't been physically present in NY for the 365 days, (2) personal information like social security number, DOB, address (?) Anything else? Does it need to be coming from HR or from direct report (or doesn't matter)?
@kristinelbly @TomD8  @goodfella @DanielV01 Thank you!