Dude, just wrapp it up well, put recipients name and address on it, take it down to the postie , ask for either 1st class recorded, or special delivery(which ever is your preference) and hand over your cash and package.
Wrap it in bubblewrap, place in sturdy box & seal. Label clearly. Take to local post office, fill in Special Delivery slip, curse when they weigh it and it's a fraction over 2kg (kerching!), pay the bill, walk away.
You don't need to state what's in the package and no-one will care. Never had any problems posting markers SD (I avoid recorded for anything valuable).
Because I am from Scotland, live near to Glasgow and like to keep tabs on who has markers in this country to either help them out if they dont have a place to play or to invite them to days elsewhere if they do play somewhere else.