You have up to 45 days to file a dispute in PayPal and up to 60 days to leave feedback for the seller. It is now too late to do any of the two. Even if you message the seller, I doubt they will resend the item since you can't even leave negative feedback or file a claim against them.
Next time, go to the resolution centre in PayPal and file a claim if you still have not received an item you purchased after a month's time just to be on the safe side. If you don't receive an item, PayPal steps in and takes care of everything else ONLY if you have used the resolution centre.