Think that may have been Otoh related... but again, hopefully people read the fine print before hiring a service like this.
Most (if not all) will not cover digital values especially if there are coins with holograms:

Section X, subsection B, part 3:

3. If Your Shipment contains securities, traveler’s checks, holograms, magnetic strips, credit card stock, data media, computer components or similar items, Brink’s is
only responsible for replacement cost without regard to information contained on such items, unless the parties have otherwise agreed in writing to have special
terms in connection with such items as set forth in any Rider(s) to this Contract


Seems like you might be able to get a special conditional rider attached to this contract