Applying to Central Refrigerated - Job history question

Hey everybody, I'm a long time lurker and finally decided to join in on all the fun!

I'm applying to Central, and am just wondering, how do they want me to verify that I was unemployed for a period of time? By just having a couple people write a letter saying they know I wasn't working? Or does something have to be notarized?

I've already talked to a recruiter about it, but I'd rather hear from people who have been there, rather than get to SLC and find out what I have isn't good enough and get sent home.

BTW, I did not collect unemployment during this time, so that's a no go.

Thanks for all your help, everything on this forum has been a HUGE help to me!