With both seeing the usual tabs you would have had problems plugging them in. Forcing a plug in would likely see pins bent. But you would have known right away with the plugs having the one way locking tabs.
The sockets on the board itself have recesses for the tabs on the one side to prevent reverse plugging. The only way you would see a cable without a locking would be pulling an old cable out of a storage box where some old ide cables lacked it. Those were rare even several years having been made by 3rd parties not seen included with boards.
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