See my previous replies. You can insure the cash and the seller of Monero has to put up 115% at least of the value of the trade. The buyer at least 15%, if either tries to scam they lose it all. Registered mail provides a legally binding chain of custody, you not only would it be difficult to convince and arbtrator that the other party didn't actually sign for the delivery or didn't send the cash, you would also be facing felony fraud charges.

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Much more than KYC payment apps like Zelle or CashApp and WAY more private than KYC exchanges. USPS privacy law is strict and the trail is only kept on paper unless law enforcement can prove probable cause or you declare a value over $10,000 in which you have to submit an IRS form of the transaction. You can send it in the mail in another state, writing with your left hand, wearing gloves, with cash recieved from businesses instead of an ATM, with a fake return address etc. etc. This is nearly perfectly private but risks loss of funds. The tradeoff is up to you.