The usually-reliable Rotorspot website reports that of the 307 production ships out there, three were written-off: MSNs 37, 74 and 125) and six have had their registrations cancelled for some reason: MSN's 24, 79, 185, 223, 224, and 266. (MSN 65002 was also cancelled, but that appears to be pre-production - maybe a flight test ship.) No idea what might cause a relatively new ship like the 505 to have its rego cancelled.