If you're buying a pack from a private party, make sure you agree up front with the seller that you can return it if it doesn't work for you. I hope you did that in advance! Otherwise you'll have to sell it yourself if it doesn't work for you.

Although a lot of us dislike PayPal, it does provide slightly more protection for both buyer and seller than just sending a check. Better, use your credit card instead of having PayPal take the funds out of your bank account. That gives you the additional protection of the credit card.