How to get the USCIS Case number from "LCA or ETA Case Number"

From my employer i am not able to get the USCIS Case number. But i got the “LCA or ETA Case Number” from my employer. Using this ETA or LCA number how can i find my USCIS Case number to check my status in USCIS Website.

Thanks in advance!

USCIS case number is issued only if you have made through the lottery. Did you?

Also, there is no correlation b/w LCA or ETA number and USCIS receipt number. You cannot get one from the other.