The best thing would be to consume it as soon as possible, to fully enjoy all its aroma and not risk losing none of its nuances. But if you have to keep it because you have to use it for a dinner scheduled a few days later, here are some tips: you can wrap it in a piece of kitchen paper and store it in the fridge (for a maximum of a week), remember to change the paper once a day. Or you can put the truffle in oil, and then in the fridge (for a maximum of 7-10 days), then do not throw the oil because it will be slightly flavored and then you can use it for your recipes. Finally, you can also freeze it and in this way it will be stored for up to 12 months. Do not forget, however, that with this method, when you unfreeze the truffle, it is recommended to grate it before to be defrosted or it will become soggy and therefore hardly unusable. If you have the chance, you can vacuum it for more storage.