Перевод - Турецкий-Японский - taklitlerimizden sakının

Romanized:
Mozo-hin ni go-chui kudasai
Literally:
Beware of imitations
In context, this is enough to convey the meaning of "our products," but if you wish to stress the meaning of "our products," the Japanese is:
弊社の品物の模造品にご注意ください
Romanized
Heisha no shinamono no mozo-hin ni go-chui kudasai
Literally
Beware of imitations of our company's products