Are there custom fees that the seller needs to pay? Do these fees vary depending on the declared value of the item? For example would shipping a 0.1BTC casascius coin oversees differ in price than a 10BTC coin?
Do people tend to fully insure these items at full value, or does that raise suspicion? For example shipping a very expensive miner and declaring it for $30,000.
Certain items do require customs fees as well as a declaration of export from the seller. Also, you typically DO want to insure your goods at full value (especially with physical coins and/or computer equipment).
Alternately (I figure I'd plug myself here), I'm trying to get a reshipping service started. If you are receiving goods (typically multiple packages) from around the US and want to pay one international shipping fee, I charge shipping cost + 5% in BTC/LTC.
So how it works is this - the items are shipped to me (I don't need to know what I'm receiving). I repackage them (optional, but pretty much a must for multiple items received from multiple sources, or for stealth purposes (use your imagination)) and ship them to you/elsewhere at the lowest rate possible.
This service isn't really for a person-to-person delivery, it's more intended for someone (for instance) in Canada ordering 5 things from different US vendors to avoid 5 international shipping fees.
Anyway, just don't skimp out on the insurance. You don't want to be "that guy" who has a miner damaged and end up losing out.