⚠️Here's the Problem You're Actually Trying to Solve

Your car key fob sends out a radio signal. Normally that's fine — it only unlocks the car when you're right next to it.

The problem is that thieves have figured out how to cheat this. They use a small device called a relay amplifier. One person walks up to your front door, picks up your key's signal through the wall, and passes it wirelessly to a partner standing next to your car. Your car thinks you're right there. It unlocks. They drive off. The whole thing takes about 20 seconds.

🔬So Can a Tin Box Actually Stop This?

Yes — and the reason is physics.

The catch is that not all tin boxes are built the same way. The lid seal, the wall thickness, and the seam quality all affect how well the box actually performs. And this is where things get interesting.

Wholesale Empty Square Tin Box

📊Which Type of Tin Box Works Best?

Here's the ranking, from most to least effective:

• 🔄 Best
  Screw-top tins The threaded lid creates a continuous seal all the way around — no rim gaps, no weak points. If you're specifically buying a tin box for this purpose, get a screw-top.
• ↔️ Best
  Sliding tin boxes The sleeve overlaps the tray on all sides. That overlap creates natural signal shielding without relying on a single contact point at the lid rim.
• 🔐 Best
  Child-resistant tin boxes The push-and-turn mechanism forces the lid into a tight locked position every time. Originally designed for cannabis tins and medication — excellent signal blocking as a side effect.
• 🔓 Good
  Hinged tin boxes Depends on the latch quality. A hinged tin with a solid front closure performs well. One with a loose fit doesn't.
• ⭕ Moderate
  Standard round press-on tins Your classic cookie tin or biscuit tin. Works if the lid is a tight fit — but many standard tins have small rim gaps that let some signal through.
• 🎁 Skip
  Thin decorative tins Thin walls, loose lids. They look nice but they're not doing much for you here. Save these for gifts and cookies — not car key security.

⚖️What About RFID-Blocking Pouches?

They exist, they work, and they're specifically engineered for this purpose. If you want a guaranteed, tested solution — a dedicated RFID-blocking pouch is the most reliable choice.

But here's the thing: most people don't want to carry a separate pouch everywhere. A sliding tin or screw-top tin sitting on your entryway shelf is a practical, permanent solution for when your keys are at home — which is exactly when relay attacks happen most often.

Plenty of people use both — tin box at home, RFID pouch when out. That covers everything.

Small Rectangular Hinged Tin Box

🔩Why Tinplate Actually Works for This

📦What Tin Boxes We Make at Longteng

While we're here — here's the full range of tin boxes and tin containers we produce from food-grade tinplate: