https://www.tn.gov/workforce/employers/staffing.html

to get unemployment, you have to go online and verify that you are still not employed...must be done each week...if you don't complete this process..no unemployment benefits.

If you hire them back...you don't tell TN Dept of Labor anything...the employee not signing up that week does that basically.

I would certainly think you could hire 4 new employees.  I know of very few businesses that have the same payroll people as they did in 2019... which is the basis of most of the PPP loans I have helped with.THe W-3.