Simple Agreed to Purchase a Quantity of Bird Feed for His

Simple agreed to purchase a quantity of bird feed for his canary from a local pet shop.The shopkeeper agreed to weigh the feed,and have it in a package for Simple when he returned in one hour.The shopkeeper weighed the feed,and wrote the weight,price,and Simple's name on the package.Before Simple returned,the package was stolen from the shop.
-The goods were unascertained goods,and title passed when they were unconditionally appropriated to Simple by the seller's act of writing Simple's name on the package.