Several stores in my area get "Barn Cats" from the local shelter to keep rats/ mice off of their inventory. The local shelter gets strays all the time. Instead of killing the strays when they have too many, they neuter them and put them back where they were caught or they give them to local businesses that are willing to house them. The cats usually aren't raised to be social but will hang around certain areas where they have comfortable accommodations and food and will make sure those areas are free of pests. They are usually taken by farmers wanting cats to keep rats out of their barns, hence the name "barn Cats", but recently they have been sending several to Home Depot garden centers and other nurseries.