Have the client give you their year-end paystub.  It will show YTD earnings for various categories (such as RSU income).

In your case, I'd bet half of the RSU shares were withheld to cover the taxes withheld and the remainder were sold same day for a $2 loss (fee).  But that's pure speculation on my part. 🙂

As Lisa said, you're probably also looking for a 1099-B.  If not, I'd get a year-end broker statement from the client showing number of shares still held on 12/31.  Shares vested, they were either sold or they're still held somewhere.

Rick