Question how to get id of a crate key?

so, i own a server and i have crate keys when you vote but... the plugin i use RewardVoting the item you give them has to be the id of the item and i got crates plus 1.12.2 and first, i dont know how to get the id and since the key is a tripwire hook will it show the id of a tripwire hook because i want it to give them the key not a plain tripwire hook. if can help plz comment!