Could be way too soon for anyone to know if hets they bought as babies will prove out. Even if they bought breedable pairs last year, they still need to have successfully bred...lay viable eggs...and then wait for the eggs to hatch.
Even if a het pair makes a clutch of all normal-looking babies...you can't be SURE that one or both parents aren't het, because the odds may simply have been against you on that first clutch.
That's the frightening thing about buying hets from an disreputable source...it can take YEARS to prove you've been scammed...and by then, it's usually far too late to do anything about it.