I couldn't work out if it's possible to order more bolts, I might be wrong (hope so) but didn't it say that the key is specific to the bolt?
If you already have a key, you input your unique number in the 'notes' at some stage of the ordering process. I've just ordered a new (spare) key and bolt.
@Bezzin started
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I couldn't work out if it's possible to order more bolts, I might be wrong (hope so) but didn't it say that the key is specific to the bolt?