Trying to work out whether Japan is workable at the moment, because the rules I find online contradict each other.
Correos scans are generated at the hub, so a silent tracking page is not evidence of a problem for the first 11 days.
A written confirmation email after every phone call is the cheapest insurance there is.
A card that works domestically can fail on an international merchant for dull, uninteresting, entirely legitimate reasons.
Any experience with the equivalent in another country would help.
Be careful reading one parcel as a rule. Two successes build a false model.
The sticker on the box is just so you know they were in there. It is the letter that matters.
The address matters more than the contents eventually. Changing what you order when the address is flagged changes nothing.
Do you contact the customs office or the carrier first?
The published rule and the enforcement pattern are different documents. Only one of them affects you.
Three month limits are cumulative across parcels in more places than people realise.