Introduction
Imagine being able to track a piece of mail as it travels across the ocean, hidden inside a seemingly innocent postcard. This isn't science fiction—it's a technique demonstrated by Dutch journalist Just Vervaart, who used a hidden Bluetooth tracker to follow a naval ship from Crete to Cyprus. While his actions highlight security vulnerabilities, they also offer a fascinating lesson in covert mail tracking. In this guide, we'll break down the steps to discreetly hide a Bluetooth tracker in a postcard, based on real-world methods. Important: This information is for educational purposes only. Always respect privacy laws and obtain proper authorization before attempting any tracking.
What You Need
- A small Bluetooth tracker (e.g., Apple AirTag, Tile Slim, or Samsung SmartTag—choose one with a thin profile)
- A sturdy postcard or large envelope (thick paper/cardboard works best)
- Sharp craft knife or scissors
- Thin, strong adhesive (glue stick or double-sided tape)
- Matching paper or cardstock to patch any cuts
- Optional: A pen or marker for addressing
Step-by-Step Instructions
Step 1: Select and Prepare the Tracker
Choose a Bluetooth tracker that is as flat as possible. Remove any key rings or bulky attachments. Some trackers come with an adhesive backing—if yours does, leave the protective film on until you're ready to secure it. Ensure the battery is fresh and the tracker is properly paired with your smartphone. Test the tracking range in your home before proceeding.
Step 2: Choose the Right Postcard
Pick a postcard with a thick, multi-layer construction—tourist postcards or blank folded cards work well. Avoid flimsy paper that can't hide the tracker's bulge. If using an envelope, choose one with a padded interior or multiple paper layers. The goal is to make the tracker undetectable to the naked eye and touch.
Step 3: Create a Hidden Compartment
Carefully cut a slit along one edge of the postcard using a craft knife. The slit should be just wide enough to slide the tracker inside. Alternatively, if the postcard has a folded seam, you can pry it open slightly. For an envelope, cut a small hole in the inner layer and slip the tracker between the outer and inner paper. Work slowly to avoid tearing the card.
Step 4: Insert and Secure the Tracker
Slide the Bluetooth tracker into the compartment. If there's extra space, stuff a thin piece of cardboard or paper inside to prevent rattling. Apply a thin layer of glue or double-sided tape around the edges to keep it in place. Make sure the tracker's button or speaker is not pressed against the card, as that could activate sound or damage the battery.
Step 5: Disguise the Compartment
Cut a small piece of matching paper to cover the slit or hole. Glue it down carefully, smoothing out any wrinkles. If the card has a printed design, try to align the patch with the pattern. Let the glue dry completely. Run your fingers over the area—it should feel flat and seamless.
Step 6: Address and Mail the Postcard
Write the destination address on the postcard as normal. If you're tracking the card itself, address it to a trusted location (e.g., your own home or a friend). Apply the correct postage. Drop the postcard into a mailbox or hand it to a postal worker—avoid marking it as “fragile” or “electronic” to avoid extra scrutiny.
Step 7: Monitor the Tracker's Location
Use the tracker's companion app (e.g., Find My for AirTag, Tile app) to view its location. Keep in mind that Bluetooth trackers rely on proximity to nearby devices for location updates. In transit, the card may only update when passing through areas with dense smartphone usage (e.g., post offices, airports). The Dutch journalist tracked a ship for about a day before losing signal—plan for intermittent updates.
Tips for Success and Avoiding Detection
- Battery life: Most trackers last a year or more, but cold temperatures (like in cargo holds) can drain them faster. Use a fresh battery.
- X-ray detection: Many postal facilities use x-ray scanners for packages, but postcards and greeting cards often bypass this step. After the Dutch incident, authorities now x-ray electronic greeting cards—so avoid using any card that says “electronic” or “greeting” on it.
- Manual inspection: If a postal worker feels a bulge, they may open the item. Keep the tracker as flat as possible and test the card's feel before mailing.
- Legal considerations: Tracking someone without consent is illegal in most jurisdictions. Use this technique only for tracking your own property or with explicit permission. The Dutch journalist's story shows how quickly authorities can find and disable the tracker (within 24 hours).
- Ethical use: Consider using this method to track lost mail or to test postal delivery times—not for surveillance.
By following these steps, you can replicate the Dutch journalist's technique—but remember, with great tracking power comes great responsibility. Always stay within legal boundaries and respect others' privacy.