dang! what kind of trap did you buy, or even better question, what kind of lure did you use?
although i know the answer-wrong kind
best/cheapest hornet trap:
3 beers a six pack
drink half of every beer, now this varies, if you're tougher you can buy a twelve pack, or two six packs
now that you have 6 bottles half way empty, just leave them in front of your hives, hornet climbs in, but can't climb neither can he fly out(physics). it works for wasps to, but i think not that efficient. although the lure does work.