I use like 5 shhets of paper and put in a get well card and send two day in a flat envelope. Over several years I have never had any issues. Always receives a 4 day processneverbeenstolen from only use in mm sectionThat works well, I have done small amounts and put them in thick Bday cards.
when large amounts, I use blank papers to cover the c@sh and send it on a more expensive method to ensure it gets there.
I have used magazines etc