"At The Mystery Box Co, every mystery box ships FREE — no tricks, just treats! Our friendly monsters make sure the surprise comes straight to your door without extra cost. Unbox the unknown, shipping’s on us!"

MONSTER DEALS

Pick your monster box!

Welcome To the Mystery Box Company!

Mystery Box Company is where curiosity meets surprise. We specialize in selling real undelivered mail as mystery packages. Neither you nor we know what's inside—making every box a genuine surprise. From quirky trinkets and nostalgic letters to completely unexpected oddities, every delivery is a roll of the dice.

We source authentic, unclaimed mail from USPS auctions and other legal channels, then package it into mystery boxes of various sizes. Whether you’re buying for fun, gifting someone curious, or filming the next viral unboxing, our boxes promise one thing: you never know what you'll find.

Step 1


Choose your box size, place your order, and let the anticipation begin. We’ll ship you a hand-selected bundle of authentic, undelivered mail—the kind that got lost, forgotten, or returned to sender. The mystery starts the moment it lands at your doorstep.

STEP 2

Grab some scissors (or your bare hands, we don’t judge) and dive in. You might find vintage postcards, oddball gadgets, unopened letters, or things you can’t even explain. We don’t peek, and neither should you—until it’s time.

Step 3


It’s thrilling, it’s hilarious, and it’s downright weird. Whether you’re laughing at what you’ve uncovered or scratching your head in confusion, every box is an unforgettable experience. No two boxes are the same, and each one is a journey all its own.

FINAL STEP

Had a blast? Share the fun! Let your friends in on the mystery, so they can get their own box and join in the adventure. After all, what’s more fun than a surprise you can experience together?

500+ Five star reviews and counting!

  • ⭐️⭐️⭐️⭐️⭐️


    "Absolutely incredible experience! I ordered a mystery box, and I couldn't believe the quality of the items inside. Every single product was something I loved and could use. The surprise element made it so exciting, and I will definitely be ordering again. Highly recommend!"

    – Samantha R.

  • ⭐️⭐️⭐️⭐️⭐️


    "I absolutely loved the mystery of it all! Not knowing what was inside made the unboxing experience so exciting. Each item was a total surprise, and it felt like I was opening a gift from a secret Santa. The thrill of not knowing is the best part, and I can’t wait to see what I’ll get next time!"

    – Ethan D.

  • ⭐️⭐️⭐️⭐️⭐️


    "Unreal! The box I received was packed with high quality, useful, and fun items. It was like receiving a surprise gift from a friend. I love the excitement of not knowing what’s inside, and The Mystery Box Company never disappoints. This is a must try for anyone looking for a little thrill in their life!"

    – Olivia T.

Keep up with the monsters on social media!

They're curious, cuddly, and totally chaotic (in the best way) — meet the friendly faces behind The Mystery Box Co! These lovable monsters are always up to something fun, from sneaking peeks into surprise boxes to sharing behind-the-scenes silliness.