I experience a parcel lose by US priority mail service. The tracking code provide only can track with in US. When out of US it is consider normal item, there will be no tracking. Anything happen to it will be not claimable because US post confirm it is ship out of US but Malaysia Pos never receive it. But it doesn't happen very frequent, I only experience once but it is an important item that I have lose.
If it is really important better use more reliable postage service.