I RMA'ed mine to Corsair over a month ago using Royal Mail International Signed For Airmail with extra insurance. Their tracking system shows that it's been passed to the US Postal Service but they don't track it after that. The parcel should have arrived ages ago but hasn't so I don't know if it's lost in the USA somewhere, nicked, stuck in US Customs or whether Corsair have received it but have mislaid it. I read elsewhere that even though they get a record of the signature being taken they don't update the RM website with the details - great huh? Now I have to decide (see my other thread) whether to risk buying some more RAM. I really, really wish I'd used FedEx or some other service where they have proper tracking.
From looking at the Corsair forums, their RMA service seems very mediocre and needs a lot of chasing sometimes. Frankly, after this experience and reading their forums I don't think I'll be buying a product that needs RMA'ing all that way again if I can help it!
Sorry I couldn't be more positive! But send via FedEx or such like and chase them up over the phone* if you don't hear anything a few days after delivery and you should be ok!
(* they don't chase RMA statuses via the forums anymore - you have to phone a US phone number).