More than likely it just wasn't big enough to bloom, so no berries this year. Some bushes are pretty picky about living in pots. They are not sexed like hollies as far as I can tell, they are related to other rose family shrubs like Pyracanthea, hawthornes, etc..

I doubt the nursery bothered with propagating them. It is usually cheaper for them to buy them in and just grow them for one season and sell them then to take the years it would take to size them up.

Thanks!!!