PayPal can try to reverse credit card charges or reimburse your $ if the good never arrived or not in order.
'PayPal Buyer Protection Policy. PayPal Buyer Protection Policy is our program to reimburse buyers for payments made to sellers on an eligible eBay website when: (a) goods are purchased but not delivered to the buyer (item not received), or (b) goods are delivered but are "significantly not-as-described" in the listing. If you are eligible under the PayPal Buyer Protection Policy, PayPal will first try to recover your payment from the seller. If PayPal is unable to recover your payment from the seller, PayPal will pay you the maximum amount of coverage for which your transaction qualifies. In order to qualify under the PayPal Buyer Protection Policy, your purchase must meet all of the eligibility requirements below, and you must comply with all of the buyer responsibilities below.' (From Paypal webpage:
https://www.paypal.com/row/cgi-bin/webscr?cmd=p/gen/ua/policy_buyer_complaint)
Shipping from say United States/China for example usually takes 1 week(Normal USPS/CPS Airmail), normally what I do is to pay a bit more for shipping and insist on either trackable shipping or even FedEx/UPS. And save a copy of the auction webpage that you bought/won.