Getting references after a company closes - what worked for you?

My manager was laid off too and I am unsure who to use as a reference. I have been trying to stay organised about it. HR only confirms titles and dates. How do you ask politely?

Keep everything in writing and save the confirmation numbers. It saved me later.

Thanks for writing this out. I went through something close to it 6 months ago, and it got easier once I kept a simple log of every call and form.