When Silver Nitrate is stored in labs, it is always advised to store them in dark bottles. There is a specific reason for this. Silver Nitrate is very sensitive to light. This means, that the chemical will react when exposed to light. So, when this is left exposed to sunlight or any bright light, it will start to hydrolyze. This will result in the formation of black or brown colored silver oxide and nitric acid. If this is stored in dark bottles, and kept away from contact with direct light, this reaction can be minimized and hence can be stored for a longer duration.
Silver Nitrate is an oxidizing agent, which means it will readily give out oxygen. Oxygen supports combustion or fire. Hence, while storing these chemicals, care should be taken to ensure that they are stored away from any chemical that is combustible or flammable. The reason being, that in case of a fire, the Silver Nitrate decomposes, can add to the fire by providing oxygen. Hence care should be taken to store them separately.