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I had one like that once. It was a book. And another time it was concert tickets in a huge envelope.
I have this box. It's about, 12" long, 2" tall and 6" wide. My brother says it uses electricity and you plug it into a socket to use it. My mom is also very proud of what she got me but I have no clue what it could be? I ahven't had a change to feel/shake it yet and it probably costs between $20 and $100.