How to identify PCM1704?

I bought PCM1704 K from Digi-Key. They do not have K markings, but two white dots.
 

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I wrote to Texas Instrument regarding the dot markings.

Here is their reply to my query:

"In response to your query on PCM1704 kindly note that due to marking machine issue, we are marking grade rank by white dot on package.

J-grade is one white dot
K-grade is two white dot.

Hence two white dot pcm1704 parts are from TI and is really K-grade PCM1704."