H1B Approved 后 老板收到邮件要求回答问题？

我的H1B 已经获批了（上个月）， 但是今天雇主接到一封email，说是

“Please answer the following questions in order to assist the U.S. Department of State Visa Services Office in insuring information obtained is still accurate. Your assistance will be very much appreciated.”xxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxx
“•        Do you anticipate, or are you receiving, the services of xxx(我）?
•        The address for the work location is xxxxx, Can you please provide the physical location ?

还列出了我的WAC和LCA。

.google  и落款是
Visa Support Services

Support Contractor – LDRM
U.S. Department of State Visa Services Office

email后缀是 @state.gov

各位知道这是个什么情况么？

诈骗邮件么？
. ----

LDRM的确是给dpt of state做background investigative support的公司，要不打电话去dos或者发邮件确认一下？

准备回邮；
需要的也不是什么confidential 信息；
律师说他也没有遇到过这种情况；