When I worked at DHL one of my tasks was to resolve all complaints by senders and receivers in our city. Heard this stuff every day.
Have you looking into scheduled daily pickups for senders?
Discussion
You need an account for that. Every shipment is linked to your account. An account can be accessed by a lot of people within the shipper. We manually ship without an account so there is no data trace to us as we see that as a risk. Therefore we can’t arrange pickups. We’ve asked for automatic deletion or enhanced security with shippers, but it’s simply not possible. Every shipment you make with your account is stored and linked for at least seven years. Accounts have no 2FA and are easily accessible, so we see it as the biggest risk in data gathering of bitcoiners.
Hmm gotcha. In the end the receive and return address are digitized and stored but there's no way around that with any shipper.