I got a message unauthorized user of buyer account, listing removed

[soleman5000]

I shipped an item a buyer bought from me on the 12th of January, it got delivered, and buyer left me a positive feedback. Today I got this message, 

We had to cancel bids and purchases on the following item(s) for the buyer, ( buyer username), because they were made without the account owner's permission:

153547275395 - COACH Signature Crissy Gray Jelly Slide Thong Sandals/Flip Flop Sz 7


Please note that we're working with the account owner to prevent any additional unauthorized activity.

All associated fees have been credited to your account. In these situations, we'll credit the final value fee for removed listings won by this buyer, and also the insertion fee if it was a single-quantity listing.

- We have credited any associated fees to your account.

We’ve also made it easy to relist your item if it was removed. Although the item is no longer available in search listings, you will find it in the “Sold” section of My eBay. For more information, please visit:
http://pages.ebay.com/help/sell/relist.html

--Selling tip--
To help you avoid this situation in the future, consider setting a Buy It Now price and requiring buyers to make an immediate payment. For more information on immediate payments, visit:
http://pages.ebay.com/help/pay/require-immediate-payment.html

We also recommend you take the following actions if this buyer won the item:
- If you haven't received payment, don't complete the sale or send the item to the buyer.
- Don't communicate with the buyer directly.
- Verify any payments you've been notified of by logging in to your payment account (or other online payment service).
- If the buyer requests refunds or additional payments, don't send any money without contacting eBay first.
- If you've already sent the item, try contacting the shipping carrier to find out if you can stop shipment.

If you have any concerns or questions, click "Help & Contact" at the top of most eBay pages.

We're sorry for any inconvenience, and we thank you for your patience and cooperation.

Thanks,
eBay

Please don't reply to this message. It was sent from an address that doesn't accept incoming email. 

I’m confused, do I still have the money the buyer paid me?  what happened to the listing? why did they remove the listing, if it was the buyer who was unauthorized, not me the seller, and why did they remove a listing of a sold item that already has been delivered and was no longer on the site, but in the sold section?