It is just a free-mail and there is no post in this forum about this but that does not mean it is safe.
Can you post or send me by PM full headers of the mail you received to check where the mail comes from?

Seems a litle bit strange to send money order to DHL for a box. DHL can collect their charges on delivery and I supose that must be a very small amount for a box just with keys.

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Better safe than sorry
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