That's a good thought. I'd think that the assistant went into the box, which was then hoisted into the air....assistant has already crept out at...
There's a model semi with their logo on ebay now, but I suspect it is new, not vintage. Many similar items are shown at the bottom of the page,...
The old "vanishing cow in the box" trick? Or....in later versions of Houdini's milk can escape, the milk can was locked inside a chest. Perhaps...
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