Remember, Kinko's is open 24 hours. If you don't want to use your phone number, use a friends or call FA and let them know the details and use that number. Be brave, call your local shelter. Some shelters are ferret friendly and most will work with CDFA on relocation. Let all local vets and pet stores know a ferret is out.
People often take found animals to both places.
Post flyers in a wide range, ferrets can travel. Use masking tape for sign placement. Use high powered lights that run off a car cigarrette lighter and flash lights to see into all the dark nooks and crannies outside. Have previously trained your ferret to come to a whistle, squeaky toy, or something else. This doesn't always work when they are out in a new area and could be afraid and not respond.