Depending on the insurance coverage you purchase and the place that your package got stolen, you might be able to file a claim for the lost package. Usually, if the package is stolen from your property, you can file a claim for the theft. If the package is lost in a shared room outside of your rented property, it usually is not covered.
However, filing a claim may increase the possibility of a higher premium during renewal. Therefore, you should also think twice before filing the claims depending on the value of the package.
The information in this answer is general in nature and is not legal or insurance advice for your specific situation. Policy language varies carrier by carrier; your declarations page is the final word. If you're unsure, call your agent before you need to file.