Cracking the code

Anne and Wendy are preparing for a new adult literacy class when Ben races inside the library to tell his mother that their dog, Hershey, has found a package on the porch. Anne chases Hershey around the yard until she is finally able to retrieve it and discovers and envelope with several thousand dollars of cash inside! Wendy is convinced the money is an answer to prayer -- the library's elevator is in severe need of repair -- but Anne doesn't feel right using the cash if it wasn't meant for them. There is a cryptic note in the envelope, but no signature or other identifying information. Where did all of this money come from? Who does it belong to?