Just to clarify my last point, my gift cards are always IMMEDIATELY deleted from my inbox and permanently deleted from my trash on my email box. The only place the gift cards exist are on a paper in my house and in an encrypted word document on my drive. So here are the only possible ways that the gift cards could have been stolen:
a) Someone broke into my house (without me knowing), copied the numbers from only 2 of my 15 gift cards, and then used them (highly unklikely)
b) Someone hacked into my computer, was able to read an encrypted word document, and stole the numbers only from gift cards that I purchased from paypal buy not gift cards purchased from anyone else, even though they were all in the same word document (again, highly unlikely).
c) Someone hacked into the paypal system. Considering the fact that many people have had their gift cards depleted recently, it seems that there is no question the paypal system was hacked.