The arms he was peddling were sent under separate cover.
Any materiel you take along through time has to go by separate cover.
That show has a separate $10 cover and one-drink minimum.
Under separate cover I am sending you photographs of your brother and sister.
A debit card will be sent to you under separate cover.
The report, for which you have been asking, has come to hand, and a complete transcription is being sent to your office under separate cover.
Four separate covers were shot for this special holiday issue.
He sent a man to assemble it under separate cover.
I do not wish to receive special offer mailings under separate cover.
The information you requested is being sent under separate cover.