Measuring it the first step but it's certainly not the last. You have to see parallel sides T/B L/R... Then you actually have to look at color toningon the sides, is three sides are all brownish off white and the 4th is starch white, that's a red flag. You have to look for stray markings on the edges, exacto knives and the like are not precise, they pull/tear tiny shreds from the cut side layers and leave a distinctive mark. There are a lot of other tells, size specifications are just a stepping off point
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