Have you tried loupe examination (evidence of modern or ink jet printing)? Black light (does it fluoresce?) Does light from a lamp go through the cardboard (it shouldn't)? Does it feel like old, dense cardboard? Does it smell like something old?
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James Ingram
Successful net54 purchases from/trades with:
Tere1071 (twice), Bocabirdman (5 times), 8thEastVB, GoldenAge50s, IronHorse2130, Kris19 (twice), G1911, dacubfan, sflayank, Smanzari, bocca001, eliminator, ejstel, lampertb, rjackson44 (twice), Jason19th, Cmvorce, CobbSpikedMe, Harliduck, donmuth, HercDriver, Huck, theshleps, horzverti, ALBB, lrush
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