If you were wondering what a certificate for impossible appliances is for in Destiny 2, it's simple, nothing. In short, a certificate for impossible appliances is a simple joke item like the used toothbrush that was added to Destiny 2 a while back.
Bungie also likes sneaking a few of these kinds of items when no one is looking during holiday events. Because of this, you can simply dismantle the item should you ever get one or already have one. However, some feel the item may have some use in the future, despite having no indication of it.
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It's possible but doubtful that it would ever be used for something when the item is marked in-game as something safe to dismantle. So ultimately, it's up to you if you want to save the certificate for impossible appliances, just in case.
If you rather dismantle, you can do so by highlighting the item in your inventory and pressing whatever your dismantle key is bound to. Doing so would be safe and easy and will free up much-needed inventory space for more important items.
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Andrew Vaughan is a Contributing Writer at Pro Game Guides that has written guides on popular RPGs and FPS survival titles for several years. Andrew Vaughan specializes in survival and roleplaying games and has been a lifelong gamer.