The sheriff's officers rescued the animals last month just north of the city.
Sheriff's officers say it looks like the owners decided that they could not take care of the donkeys and released them. Sheriff's officers say that is becoming a continuing problem.
The costs of feeding donkeys and other livestock have been increasing. However, it is against Texas law to "turn out" livestock.
The sheriff's office reports that the owners are aware of the law, and didn't release the animals in areas where any witnesses would be nearby.
No one showed up to bid on the donkeys.