One of the major changes is that the buyer needs to only send back the item by trackable carrier to get a refund. You could send out a $150 mainboard, the buyer then asks for a refund, and sends back a brick. as long as it is by a traceable carrier and shown to get to the sellers address, they get a refund.
There is nothing in the new policy that would suggest this to be the case.
The buyer has 30 days to file a complaint with Pay Pal. "PayPal will investigate your claim, contact the seller and,
if the seller does not present appropriate proof of shipment, a full refund or other evidence of a satisfactory resolution, PayPal will seek to collect the amount you paid from the seller."
This applies
only to non-delivery of goods, as opposed to merely items received "not-as-described":
"If your claim involves receiving not-as-described goods, we suggest using an online-trackable shipping service if you choose to return the goods to the seller. Please be aware that though
you are not covered for not-as-described claims under this Buyer Complaint Policy, using an online-trackable shipping service may help you in working directly with the seller to resolve the problem."
In addition:
"This Additional Protection
does not apply to disputes about the quality or attributes of delivered goods, goods that have been lost in the mail as shown by seller's presentation of proof of shipment, payments for services, payments to Unverified sellers, or a seller's failure to deliver intangible goods."
If you have proof of shipment, and are keeping appropriate records, there should be no problem.