The boxes have no identifying numbers to indicate date, only a product code.
It's the case that it came out of that has the date stamped on it within the 6 digit number. However, unlike Fleer, the cases are less correlated to their exact printing press run. Topps cards were printed off site and shipped in to Duryea to be cut and packed. After they were packed into boxes and cases they were stacked in the warehouse. Only when the orders came in for shipment were the cases stamped - by the packing/shipping department. So there were quite a few steps in between printing press and case stamping, leading to less correlation of dates with certain press runs.
In my experience the variations in press runs are better correlated to the actual type of packaging (wax/cello/rack) than to the date stamped on the case.
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