OK! Here in former Soviet area we have some stupidities in laws and some "people in need" working in post offices!
First: Law
Just for example: Latvian law prohibits sending outside the country any items older than 50 years without permission of State Inspection of Culturial Artefacts (Or sth like that). The permission costs at last 5 lats (about US$ 10,-) for each(!) item.
Sth like that works in all post-Soviet countries. It's no more than 2 years ago a coin collector from Russia was sentenced to couple years in prisson for attempting to send outside the state 4 chinese coins of less than US$ 20,- value.
Second: Law again
Law prohibits sending money in uninsured postage or at post at all.
Everything that can be ripped off w/o damage of envelope will be ripped! Either by postmen who has a Ls 120,- (US$ 240,-) salary, either by officials at customs. In 2nd case it may come with damage.
That's what you encounter if you're going to send "in silence"
If you're trying to send coins openly, be prepeared: this law concerns any coins in circulation too!
Third: People
See the p.2! Workers of post-office. Even a registred letter can be ripped if not formed correctly
If you're sending MONEY:
1) If you're sending money avoid any currency containing mettalics, f.e. Brittish pounds.
2) Put your money between carton sheets or porstcards AND stick it with tape
3) Put the tape on "closing" of envelope!
If you're sending COINS:
There are many ways to avoid controls and "controls". Usually I do as follows:
Padded envelope, a piece of carton taken from box of electronics such as TV or Washing machine in a shape of postcard. Then:
1) Cut the holes in shape of coins, but better:
2) Cut the one large space to put eth in and cover it with real postcard, finished by tape.
After go to the PO and send it as Registred letter! If asked why in such a envelope, say sth like "important papers! Last time came smashed!"
AND:
QUOTE(Scottishmoney @ Aug 8 2007, 11:07 PM)

I have had eBay bidders send me loose coins in payment with dollar bills for eBay items. I am amazed sometimes that the post office doesn't rip them out of the envelope. When I have gotten mail from Russia the stamps were all ripped off the envelope though. Especially during the USSR days, when they had hammers and sickles on the stamps.
I wonder if it's remain of Soviet (and American too) "spy" period. Very popular manner of sending microfilm outside the state was putting it under stamp. Does it works till now?