He does have small "markers" but markers are unreliable in determining whether you have a het pied or not. There are plenty of het pieds that don't have markers, and there are plenty of normals that have markers but are 100% NOT het pied. If the breeder you got him from is only using his markers as the basis for calling him a het pied, then you may not have a het pied. I would contact the breeder and ask to see pictures of the parents. Even then, some breeders unfortunately lie.
I hate to say it, and I know it might bum you out, but you may very well be breeding a normal male to your normal female, which will result in normal babies. While this isn't necessarily bad, normals don't fetch much and can be hard to find homes for sometimes. Some breeders practically give them away. Even if your male carries the pied gene, the babies will still be normals that have a 50% chance of carrying the pied gene. What you could do is keep any females they produce and breed them back to the father. If you produce a pied, then you know he's a het pied. If not then either breed him to a KNOWN het pied female or a pied female and see what you get. If you don't produce any pieds, then it is highly likely (especially if you breed him to a pied female a few seasons) he is not a het pied.