Hi bluebknight..Can you find the payment in PayPal history. Overview page..view all transactions..next..activate select and in drop down (last 3 months). Click on details for payment to see transaction ID #.
Not there..is it possible that you bypassed your account and paid as a guest. Call PP and they will open a dispute for you..toll free 1-888-221-1161.
If payment was funded by a credit card you can fall back on chargeback rights by calling Customer Service # on back of card.
PP claims must be opened within 45 days so you have some time , perhaps will arrive. File on later than day 43 from payment date.