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Hi,
Keep the TN6300 toner in the original box or packaging and make sure you store it at room temperate. It’s best to store the Brother toner away from bright or direct sunlight. Lastly, keep the toner cartridges dry as any moisture will damage or degrade the toner powder.
General rule is that toner cartridges will last up to 2 years if it hasn’t been opened and stored correctly.
I hope this answers your question.
If you need any further information, please feel free to reply.