If you got a fake one, report it to Customs and Border Protection, along with as much info as you have about the path by which it reached you. They seize and destroy crap like this regularly.[1] Call 1-866-999-HALT, or see "stopfakes.gov". Mention the forged UL symbol. Also report that to UL.[2] Their report form accepts pictures.

UL puts effort into power supplies. This has been a problem with desktop machines for years. Gamer sites which review power supplies note that UL-rated power supplies don't burn out or blow up. That's because UL tests them by loading them up to their specified output with a resistor bank and running them for a few days at 100% load. They also test the overload-shutdown features. There are many low-end desktop power supplies which will not deliver their nameplate output continuously, or at all.

[1] http://www.cnbc.com/2016/01/13/us-customs-seize-35k-in-count... [2] http://ul.com/customer-resources/market-surveillance-departm...