I bought a 373 (smallish-medium stockman) from Sports Authority shortly after Buck introduced them. I recall looking over the packeging before buying it- I did not see any indication of Chinese manufacture. After I had it home, I eventually noticed the "China" stamp on the sheepsfoot blade. Had I not noticed the stamp, I would have went on thinking that it was an American made knife. The quality was very good, especially for the price- though I've noticed that even off brand Chinese slipjoints tend to be better buys than the no name tactical clones. I still have and use that knife. Of course, even the imported tactical Bucks are good quality. I have a Mayo. A relative has a (IIRC) Sandman. Buck has sourced models to Japan before (back in the El Cajon era)- so its not a new thing.
The thing is- Buck does imports right. They mark the knives. Now, they mark the packaging a lot better too. Their website differentiates between US and foreign manufacture. The import line is good quality, and the US Company not only puts their name behind it, but also their warranty. The import models have always been sourcd. The US models were and are made here. The import line helps sustain the US line- by selling knives (making revenue) from folks who wouldn't spend more on higher end knives, and it also introduces folks to the brand.
The import line was also a godsend to traditional pocket knives too. They came in and filled a void that was left when Schrade fell by the wayside. They helped keep affordable, quality traditional knives on big box store shelves. Actually, I wouldn't be surprised if there is more patterns on wal-mart shelves know than back when they sold schrades.