How to open the briefcase?

[XtremeN0Luck]

I found the briefcase and I have it in my inventory so how do I open it? I can't ask Frank or Patrick to open it so what do I do? I wanna complete the "I'll be back" achievement

[Elementus]

there's 2 ways to open it
1. Get Frank to smash it open
2. Get Rachel to give you back her thermos and give the thermos to Patrick and follow the quest

[XtremeN0Luck]

Ooh, thank you so much :)

[Kafka]

When i use the key on it, it says "you can't do that", what i'm doing wrong?

[markiezz]

Because someone likes to break things. :)