I pack cards like I pack fragile pottery...basically double boxed. Even a protective shell of insulation foam or heavy cardboard around the slab then in another thin box.
Also lots of tape around the outside...not where the card is will help protect from opening/tampering.
I recently received a card with cardboard taped over it...in a bubble...in a box. the box...and the bubble were torn open...you could totally see there was a graded card in there without opening anything. Thank god the card was there...maybe damage from a handling machine?
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