Here - I googled 'sending rear shock' and found this
How do I send my shock?
A. Wrap your shock in bubble wrap and put it in a jiffy bag, to prevent it getting damaged in transit. Enclose a returns address and contact telephone number. Also enclose a note explaining what the shock has been sent in for or fill in a service form and send to us, please clean your shock before sending it, thank you.
Service Form Once filled in , please print out and send to Mojo.
Note: It is best to send the shock with insurance cover, this can be done by sending it via the Royal Mail as recorded or special delivery or via a courier service. This also makes it a lot easier to track your shock when in transit.
So even companies who deal and repair these items are unaware of the issue.