CP72 form only prints first page

The first page of CP72 form which contains Copy #1 and #2 of Customs Declarations properly prints on letter-sized paper on Laser printer, but page 2 which should contain Copy #3 Dispatch Note and Copy #4 Sender's Copy does not print.
Shipping Flat Rate Envelope via USPS Priority Mail Express. SR Ver 10.2.6.7087