Yes they will care and it's only going to get worse. Any money without a dubious origin is at risk of being confiscated so you better be able to prove you obtained it legally.
Do you want me to cash out for you? I really think you're over egging this somewhat. All the proof anyone needs is on this forum and in their wallet's history. That's just as much proof as a house sale or car sale and considerably more than getting several grand for cleaning some old lady's drains.