Does coffee bean coffee require kosher certification?

Hello,
At work, I have a machine where coffee beans are put in, and then you choose the kind of coffee you want (espresso, cappuccino, and so on).
The ingredients are only coffee beans, water, and, for whoever wants it, milk (a carton of milk that we place there, from Tnuva or the like). I could not find any kashrut certification on the coffee beans. I saw on the bag that they are from abroad, but I did not find any certification. It may be that the certification is on the box, since they order the coffee in large quantities. Am I allowed to drink from this machine?
Thank you