I have noticed that it seems some services are not applicable to certain countries ??? But I am not sure, if so, is there a list of these countries anywhere?
I understand that the private, 3rd party insurer shipsure has a list of countries where they will not insure against loss or damage in transit. This is because they have run the numbers and found that the risk is too high. Some countries have horrible postal or customs systems. Some have high rates of postal theft. Some are fraught by war.
Most sellers will not ship to Africa. I have the continent Blocked, but I will ship to South Africa and Egypt, which are somewhat better than most.
Canada Post will give you a list -and prices- for parcels to countries when you are checking for specific rates. But the shipshure list is easier.
If someone claims they didn't receive an item and it has a tracking number and insurance, I can't really prove different, if they are adamant it is their word against the PO's.
Well yes, you can prove different. That's what the tracking number does.
Cui bono? The PO doesn't have any great benefit to claiming something is delivered when it is not. The customer could get the item plus a refund. Who benefits? Who has clean hands?
If you are selling inexpensive items, I'd skip both in favour of Cookie Jar Insurance. Search the term. I rabbit on about it endlessly.
can I say that I will not assume responsibility for the shipment if they choose International Packet Air without insurance ?
No.
If you accept Paypal you accept responsibility. After all, you chose the service and sub-contracted to them. The buyer expects to receive his purchase within 45 days (the deadline for Item Not Recieved disputes through eBay/PP) and if your sub-contractor (CanadaPost/ Universal Postal Union) does not deliver as promised, you are responsible to your buyer and the sub is responsible to you.
