there was another home located in Tama/Toledo. But it was for orphans who were in their teens and had been in trouble for bad behavior in the orphanages, like running away, we call it "acting out" today.
The records of orphans in the Des Moines orphanage "Iowa Soldiers Home were destroyed in a fire that was supposedly completely destroyed. I can't remember, but I think the home burned down like in the 60's. A newspaper article certainly would be in the local newspaper. I'm not sure if the paper back then was called The Des Moines Register.
Any records associated with orphans who were adopted out are sealed and will take an act of a federal judge to allow the records to be unsealed for public access.
The orphanage didn't operate within legal constraints, or those "loopholes". When my mother was adopted out (she was there about 1938 to 1942) at the age 7yrs, and was told her father was killed in a train accident. In truth, he obtained a divorce from her mother (who was in a mental hospital: because he babied her to death and left her to fend for herself often), and remarried and moved to Council Bluffs.
You may be able to find your information at the reform school in Tama/Toledo.(I think it was actually called the Toledo Reform School). It's still there, just called something else.
Another detail about the orphanage in Des Moines. When the children reached the age of 12 years, they were sent out to local citizens, farmers etc to do work. Some were gone as long as several months or less, and then returned to the home when the work was done. The orphans got education until they reached 12 yrs, then sent out to work too.
So I recommend trying to get information from the reform school in Toledo, IA too.