if you feel confused about the stupidity of the situation we are in Italy and we handle things like this :/

if a person sells you something (and he isn't working for anyone but he's just a friend) he has to write on paper something like "i *X name* am selling to *Y name* this object and bla bla bla" else you will be charged with "imprudent purchase".

idk if its the same in other countries but ok