OP where are you located? For our center in the Bay Area we never have a problem getting helpers. Poor guys always ready to work and so optimistic about being kept as an inside employee. I tell them from day one, if you want a chance at staying on part time, get a job in the warehouse. This helper stuff is temporary.
The real lucky folks are the people who they allow to be helpers in the first weeks of January, since they get paid top driver rate. I think it's pretty ridiculous how a helper in January can be getting paid more than a driver still in progression, even it is just for a short time.
Anyhow, I noticed this year that a few drivers started asking all the better looking female preloaders early on in the beginning of November if they wanted to be a helper. Lol those sneaky bastards.