I have learned that a person (A) I know is being asked to carry out cash purchases of expensive coins by their neighbour (B) under the pretense of working close to the (brick-and-mortar) store which offers said coins.
I am somewhat worried that this might be the run-up to some kind of scam or involvement in money laundering. So far I see no opportunity for a scam and the people involved are long-term neighbours (at least 5yrs), and also have a bit of a personal connection. The way to the store is indeed a bit longish, I'd say, 4hrs. round-trip. AFAIK the cash is paid upfront and there is no banking involved. A receives the money, carries out the purchase and returns the goods to B. There is no expected payment or anything involved.
This all sounds benign, but then I am kind of baffled by the amount of money involved which is roughly 1000 euros.
What measures should A consider to guard against accusations which might be brought against them later, if they do not want to plainly deny the request? What kind of accusations could follow? I am mostly worried about money laundering regulations, but maybe I have missed something.
Would receipts about money being received, and goods being returned, hold up to legal standards? The country would be Germany.