B5C hard reset?

Hi! After been in storage for almost two years i today opened the box with an unused B5C. To my suprise i see the device have been used before since it shows wear on the backside and it was some small piece of grass inside the box!? Mimosa used it in a graden party?
The box was sealed so what could have happened here?
Anyway i cant connect to it since it probably have a static IP i dont know and a unknown password are also set on the 2.4GHz login. A recovery SSID dont either show up.
Since the warranty probaly are gone i will open this thing if needed. Any hard reset button inside?

Advice: Never leave a new box in storage for a long period…

http://backhaul.help.mimosa.co/backhaul-faq-b5-b5c-device-reset