Not necessarily. You can buy NWT jeans from places like Nordstrom Rack that have been previously altered. It's also possible the seller bought them and had them altered before taking any of the tags off and now they don't want them (basically what Carol added)Men's Rock and Republic Jeans - eBay (item 110465654863 end time Dec-10-09 13:50:28 PST)
I assumed this was a fake also because of the 30 inseam on a NWT.