My apologies. The box does say that. My problem is that my private sources tell me that you cannot make solid powder Ammonium Ferric EDTA! It only comes as a solution much like most Ammonium Thiosulfate. In fact, the key patent is by Stephen and Surash if you wish to look it up. They show how it is made but don't (IIRC) mention that it could not be prepared as a solid. This was known though at EK.
So, I assumed that this was in error. If you find that powder form Ammonium Ferric EDTA does indeed exist, please let me (and others) know.