How to Remedy a Lost Cashier's Check
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You can also typically provide the destination fund as a mailing address and not have to manually forward it, but, yes, this is weirdly still paper mail.
The US Treasury also allows you to convert old paper savings bonds into electronic format by sending them in the mail. I expect that the theft rate for envelopes sent to the US treasury is exceptionally high.
In that situation, who's liable if the check doesn't show up?