Sending coins back to the Mint.

How long does it take to receive conformation on the return of coins sent back to the Mint? I called the post office and they said it had been delivered and the Mint says they have not received it....I am worried as this was a lot of money tied up...can someone give me some lite on the Mints procedure and time frame? Thank You.
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On the two occasions that I sent coins back because they were defective, it was on a credit card, and I got messages from them within a couple of weeks of returning the items. And the credits appeared on my next credit card bill.
I've not had a problem so I did not count the days. My main problem was that the coins were really bad (finger print on a Proof, MAJOR marks or manufacturing problem on a Prooof) and had no business getting past their quality cointrol from the get-go.
About a week or two after the Post Office says they delivered them, they will show up as returned in your Mint account. It takes a while. I think they need to verify the coins before they issue credits and such.
Also, the Customer Service rats don't know anything about the returns, so don't even bother talking to them, they just look at the account and see the same thing you do.