Worker ants are females.
Considering that worker ants are sterile females, I do not understand how this “reservoir of genetic material” theory might actually work.
It is fairly common for ants to dump waste material in a specific location outside of the nest. They exhibit surprisingly complex behavior for such tiny creatures.
That was my first thought, too. If ants do it, then surely humans ought to do it too!
Edit: to clarify, when I was a kid I studied ants extensively and I wanted to become a myrmecologist. But then I started chasing computer bugs instead.