Volunteers were more eager to provide you with the Driver's license and social security numbers? I've urged all the coaches to fill it out themselves so that I don't see any of their personal information.
We have about 50% rate so far. I just sent an email clarifying that no teams will be released to coaches/parents unless every assigned volunteer passes a background check.
The email from JDP is confusing and looks like spam. It might be a good idea to include a copy of what the email looks like to coaches.
Also if you are using Blue Sombrero it is easy to track which volunteers have passed and the team assigner can see who has passed, failed or have not completed yet.
Finally, with Blue Sombrero - the registration data is automatically uploaded to Little League. So they know how many parents have volunteered and how many background checks you have completed (if using JDP or First Advantage).
We used a different system last year (Bonzi or now know as Stack Sports) and I got a stern email from Williamsport that we hadn't conducted any background checks. I had to tell them we were using Stack Sports to conduct the background checks.