I am supposed to start working in a trustworthy company in a company next Monday. The company has two offices I have to work in. I signed the contract three months ago. I heard from the boss via email three and four weeks ago about my ID and registration card for the building, but this week they didn't send me anything about which building I'm supposed to start in, or whether they work from home, etc.
Someone has to tell me where I will start and what my first task is etc, but I still haven't heard anything. Today is Wednesday, and this week I need to know these things, since I start working on Monday.
I'm a bit concerned as to why they haven't written to me with details about my first day of work yet. I still have tomorrow and Friday. I want to write to ask about these things, but at the same time I feel like maybe I should let them contact me about it. Should I contact them or should I wait until Friday? (I hope they haven't backed off and changed their mind about my employment.)