Given the mold damage to your belongings over two years, it's essential to understand that renters insurance typically covers damages from sudden and accidental events, not ongoing issues like long-term mold growth.
Coverage for mold is often limited and may only apply if it results from a covered peril, such as water damage from a burst pipe, that was promptly reported. Persistent mold damage due to maintenance neglect is generally excluded. For a definitive answer on your specific situation, review your policy details and consult with your insurance agent.
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.