what do you think OEM means? And if you read the description, the seller says he packaged them himself. But if the cable has Apple packaging, it is almost 99% fake as Apple design not sell the to distributors and the gray market price for those are very high.
Original equipment manufacturer. Meaning these are the orginal apple cables.
The fact that they don't come in standard packaging can simply mean they had oversupply, sold it without packaging in bulk for cheaper.
This happens all the time.
The problem is, you do not really understand what OEM is. Apple is not an OEM, and about 200 factories are apple cable OEM. They can still sell non mfi cables. If I could buy mfi cables for $1, I would buy 100 million today.
I've gotten many mfi cables for $1 or less.
You should hang out on slickdeals a bit or even the ebay dd.
Even apple cables for $1.
As known, eBay subsidizes many deals so nothing is unbelievable.