Just a bit of info regarding the fate of MM417, although it seems to have been resolved now anyway. Try contacting the RAF Museum at Hendon; they will have a copy of its aircraft movement and accident card. Every RAF aircraft had an a/c movement card (Air Ministry Form 78 ) and if it suffered an accident, an accident card (AM Form 1180). These gave only basic info, but include relevant details, such as units and where and when an accident occurred.
Before anyone asks about 487 being an RNZAF unit, so the info would be in NZ; it was not, 487 Squadron was an RAF unit, not RNZAF. The New Zealand squadrons in the 400 series RAF units, 485 to 490 were written as "487 (New Zealand) Squadron, RAF" and were never on the RNZAF's order of battle. This also applied to 75 Sqn, which became a NZ squadron during WW2. It wasn't until after the conflict that it became an RNZAF unit. 75 (NZ) Sqn was the first dedicated Commonwealth unit in the RAF.
In general the other countries' units in the 400 series were the same, although they were known as, for example, 453 (RAAF) Squadron; strictly speaking 453 was on the order of battle of the RAF, not the RAAF. Some of the 400 series units were adopted by their host nation post-war, such as the Canadian ones (409 and 410, for example), but during the war they were RAF units, just largely populated by personnel from their host nation.