H-1B employers sometimes would ask why they are filing the H-1B under the regular cap when the beneficiary who won the H-1B loettery holds a U.S. master’s degree. The simple answer: the selection notice says so.
Note that during H-1B registration, the registration is simply requesting consideration for Master’s Cap registration when a beneficiary holds a qualified U.S. master’s degree. Whether the beneficiary is selected as Master’s Cap or Bachelor’s Cap is based on the lottery results, as indicated on the selection notice.
Please look at the selection notice closely (it is somewhat hidden in the text) to find out if a beneficiary with a U.S. master’s degree was selected under the regular or master’s cap. This will help ensure H-1B forms are properly filled out.