Oof, that’s stressful. Those identical hard shell suitcases are a disaster waiting to happen, especially on buses where everyone grabs bags fast and leaves. You’re probably right that the other person grabbed yours thinking it was theirs.
First thing I’d do is contact FlixBus support ASAP with the route, date, and luggage description. They do log lost and mixed up bags sometimes. I’d also post in any local Poznan or Amsterdam travel groups since the other person is likely just as confused right now.
If there’s anything inside with your contact info, hopefully they’ll reach out once they open it. In the meantime, do not take anything out of that suitcase so it’s clear it was an honest mix up.
Really hoping this resolves quickly. This kind of thing usually ends up being a swap, not theft.
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