At any event I have been to, you can spot the goodie hunter before they reach you.
The tell is the eyes. They scan the booth for the gift before they make eye contact with anyone. If they find it - a tote bag on a shelf, a spinner wheel, a prize display - their body language shifts. They are already calculating what it will take to get it.
Do not expect bad data to expose them. These are not careless people. The visiting card they hand you matches their badge exactly - same name, same company, same title. They registered properly. Your CRM will accept them without a flag. The data looks clean because they made sure it would.
What gives them away is not what they give you. It is how they arrived.
They move in groups. One person reaches a booth and texts the others - which company, what the gift is, what you have to do to get it. By the time the second and third person arrive, they already know the script. Scan, spin, collect, leave. The whole interaction takes ninety seconds.
They also share across events. If another conference is happening in the same city on the same day - a product launch, a networking evening, a brand activation by some other company - they know about it. If the gifts there are better, some of them will leave and not come back. You may not notice the drop-off until you look at the afternoon scan numbers.
The goodie hunter is not a data problem. They are a booth design problem.
Your prize display, positioned at eye level before anything else, is the first signal your booth sends. It answers their most important question before they have asked it. Everything after that is a formality.
I have watched two exhibitors at the same event work the same crowd differently. One with the prize up front, one with a game gated behind a short survey. The first had longer lines and a weaker list. The second had shorter lines and knew exactly who was worth calling.
The goodie hunter will always find the easy booth. The question is whether yours is it.