Let me rephrase the question. Let's assume a honest seller wants to sell collectible coins worth $50,000. Would a honest seller send them directly to the buyer after escrow gets paid, knowing he may not receive his payment if the buyer (who's relatively new to the forum) claims to have received an empty box?
No.
The best practice considering the amount risked in the trade. Escrow receive the coins from the buyer, escrow receive the delivery from seller, escrow post the delivery to buyer, escrow release the funds to the seller. Using this process escrow knows that the item was delivered to the person.