Somewhat relatedly, failures of the postal service to postmark the correct date are fairly common. So I record a video of me dropping donation checks in a blue postal mailbox[1] in December (which then upholds to Google Photos, thus establishing time/date) to establish the date of unconditional delivery of said checks.
I don’t have my own mailbox, but one could argue that placing an envelope in your own mailbox isn’t unconditional because you could pull the envelope out.
Somewhat relatedly, failures of the postal service to postmark the correct date are fairly common. So I record a video of me dropping donation checks in a blue postal mailbox[1] in December (which then upholds to Google Photos, thus establishing time/date) to establish the date of unconditional delivery of said checks.
I don’t have my own mailbox, but one could argue that placing an envelope in your own mailbox isn’t unconditional because you could pull the envelope out.