[bisq-network/bisq] Add "Cash by mail" as a payment option (#1101)

[pazza]

Just trying to understand what would happen in the following scenarios as not everyone has access to a secure mail box or the same options for couriers:

- Bitcoin seller places offer to Sell 0.5 BTC on Bisq via 'cash in mail'
- Bitcoin buyer takes offer and sends the associated fiat amount for the BTC as per protocol documented above by @mutagenfork 
- Buyer sends fiat cash packaged in a tamper-resistant cash control bag via Courier
- Courier firm arrives at sellers address (house, apartment, business etc)
- Seller is not present at address so package is left at what the courier deems to be a secure / convenient location, or gets it signed by anyone else at the address eg receptionist
- Seller collects package completes trade

But what if the following happens:

1. - Seller never gets package, or
2. - Seller gets package from receptionist and pretends they never received it.
3. - Seller gets package from convenient location porch, door step, shared mailbox, behind car etc and pretends they never received it.

In all these problem instances I would assume that the seller would be successful in mediation / arbitration and the buyer would have to take it up with the courier company and claim through the insurance offered if the courier firm could not provide proof of delivery to the seller or the sellers address?

Is it a case of Buyer Beware and for them to ensure they have adequate insurance to cover any losses?

Also with so many courier companies having different terms and conditions that would potentially affect the trading protocol. Eg FedEx does not allow cash to be sent, and specifically states it is not liable for any loss of cash. USPS, I am less familiar with, It appears that they offer a '[Registered Mail](https://faq.usps.com/s/article/What-is-Registered-Mail
)' service insured up to $50,000. This service appears to direct delivery only to the addressee (or addressee's authorized agent).  This would theoretically avoid the issues above. Not sure how they verify the person they are delivering to is the addressee? Just a signature? A signature seems less secure than an identify check. A scammer just deny it was them that signed for the package.






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