In case you didn't actually read what Paypal sent you, looks like they actually just made a huge change starting Nov 18th.
" We're increasing the time for buyers to file merchandise disputes (Item Not Received and Significantly Not as Described) from 45 days to 180 days"
" We're increasing the time for buyers to file merchandise disputes (Item Not Received and Significantly Not as Described) from 45 days to 180 days"