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I'm pretty sure that there were more than a few examples of fake escher labels posted here 6 or 7 yrs ago. I used to buy old military (WW1 and earlier) postcards at the time, and you saw a lot of...

I just checked 9 boxes - none of them were made the way your one is. Similar, but different - the smaller end pieces are indeed rebated into the longer edges, but there is no retaining tenon.
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