I like Arne's answer.
prado,
Even before I saw Arne's answer, that is what I thought.
Is the box the original one for the item? Have you tried a translation of the writing on the box?
What is the text on the box? I can't read it from the low-res image you posted. It would certainly tell us (or those of us who read German).
Doremus
It would also double as a composition aid - slide in the back of the 4x5 and you get a masked 6x7 or 6x6 (hard to tell) view.
I just took delivery today of a Tech III with a similar device for 6x9 in the back of its original back, but a bit of a diy one that was permanently in place.
None of your fancy inked lines here, you know. Simple, honest black cardboard cut-outs.
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