Hello.
I never done any offences, and now I really don't know what to do.
Yesterday I was in Ciney-military expo, Belgium(I'm not from Belgium) helping my brother to sell some collectables (mostly WW2 clothes, belts, replicas). He also had some cheap aliexpress items, and they were at my table near him and Police came(without uniforms), and told me that one item I'm selling is card knife. I didn't know that was illegal, and feel pretty stupid about it now when googling about this.
They just took photo of my ID, I gave them my e-mail address and they siezed about 20-30 of those knifes, and told me that I can continue selling other stuff, just that I will get details via mail. My brother came and told that It was his stand but they didn't seem to care.
I asked them if I'm in trouble, and what happens next, but their english was kinda bad, and he said that he doesn't know?
The whole encounter was kind of ... weird. They didn't even count the items, put them in any kind of evidence bag, he just kinda stuffed them in his backpack. He also didn't identify himself (2 other guys were with him), I asked them if they were police, and then he said that he forgot to identify himself and showed me his card that looked like some kind of ID and it said "POLICE". He allowed me to take photo of it, but I'm not posting it. Other than that, they were nice, tried to explain but there definetely was a language barrier present.
I have literally no idea how to deal with this.
What can I expect now? Am I in trouble? What to do next?