You can say 제 선물을 잊지 마세요 or 제 선물 잊지 마세요, which is how most people would say it.
To make it really formal, you could say 제 선물(을) 잊지 마십시오 or 제 선물을 잊지 마시기 바랍니다.
October 14, 2018
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