北京 H1b -Chemical engineer - first time- check -issued
ceac case created 2019-3-8 (seems you may know you will be checked before interview)
1st update 2019-3-11 (interview)
2nd update 2019-4-9
3rd update 2019-4-11
Visa issued 2019-4-11
Received 2019-4-14 (mailed to Home)
some support documents provided during interview, but no additional document provided after interview.