How long does uncooked meat last when kept in the freezer?
If it is sealed in an air tight container and the freezer always stays very cold so the meat never thaws- then chicken and beef will stay good indefinitely. I have used both chicken and beef that had been frozen in my deep freezer at 0F for years with no ill effect.

I can't speak for shrimp as I have no personal experience but I would expect it to be the same.