There should be a sticker on the bottom of the box.
Swisscom has several boxes.
Use Swisscom KMM3010-SC-A for the old black and silver Box with video recorder (even the black one is KMM3010-SC-B)
Swisscom VIP1200E for the old STB without recorder
Swisscom STB3210-DVR-A for the new STB with recorder
Swisscom STB3310-NDVR-A for the new STB without recorder
old or new box? if the original remote is silver you have an old one, if the remote is black you have a new one.