Had a similar case here in MI several years back. Professional UA collector. Worked for me for 6 weeks (coincidentally) WALKED off the job. As in self-terminated, quit, gone, bye-bye without saying a word to me. I finally got a hold of him and he said I had "yelled" at him. I had gone to a job site and shown him the weeds he was missing. An hour later he was gone.
He filed and said he wasn't performing the work I had hired him for (applications) I provided paperwork showing he had done apps for 4 of the 6 weeks and the rest been spraying weeds in beds, etc. and they gave it to him.
Not sure if he knew someone on the UA board or what. I was some kinda pissed.
So, the moral of the story, depending on the situation, it doesn't matter what documentation you do or don't have. Especially when the UA board is populated by idiots.
Very sad, but in many states and many situations, very true. Obviously you want to keep your documentation and if you feel strongly about the former employee not being able to collect, you contest.