This, plus ubiquitous drone delivery systems should be make anonymous P2P physical deliveries possible.
"Cryptocurrencies such as Bitcoin enable digital monetary transactions to be carried out without the presence of a trusted intermediary. Additionally, transacting parties get to keep their real entity private by using pseudonyms which are very hard to link to their actual identities. While the use of cryptocurrencies is very attractive for individuals who want to keep their anonymity, this attractive feature soon disappears when transactions involve physical goods, particularly, because purchasers are required to provide their address information for shipping the purchased goods. The issue of anonymous physical delivery has been an open problem for all the use cases of cyptocurrencies.
Fortunately, the current rich and broad transactional platform offered by blockchains such as Ethereum [3] which support the distributed execution of smart contracts enables us to offer a solution to this problem. Lelantos is a blockchain-based system that offers the service of anonymous delivery of physical goods. This system allows the customer, merchant, and a set of customer chosen delivery companies to engage in a delivery smart contract. Such a contract acts as a trusted intermediary to enforce fair monetary transactions and to enable the contractual parties to communicate. Lelantos is composed of an onchain part which is the smart contract on the blockchain, and offchain components which are user-side applications and a web server."
https://eprint.iacr.org/2017/465.pdf
"Cryptocurrencies such as Bitcoin enable digital monetary transactions to be carried out without the presence of a trusted intermediary. Additionally, transacting parties get to keep their real entity private by using pseudonyms which are very hard to link to their actual identities. While the use of cryptocurrencies is very attractive for individuals who want to keep their anonymity, this attractive feature soon disappears when transactions involve physical goods, particularly, because purchasers are required to provide their address information for shipping the purchased goods. The issue of anonymous physical delivery has been an open problem for all the use cases of cyptocurrencies.
Fortunately, the current rich and broad transactional platform offered by blockchains such as Ethereum [3] which support the distributed execution of smart contracts enables us to offer a solution to this problem. Lelantos is a blockchain-based system that offers the service of anonymous delivery of physical goods. This system allows the customer, merchant, and a set of customer chosen delivery companies to engage in a delivery smart contract. Such a contract acts as a trusted intermediary to enforce fair monetary transactions and to enable the contractual parties to communicate. Lelantos is composed of an onchain part which is the smart contract on the blockchain, and offchain components which are user-side applications and a web server."
https://eprint.iacr.org/2017/465.pdf