What happened to all my emails in my inbox?

I used to have about 2,000+ emails in my inbox and now I only have 114. I know one of my emails was a birthday gift card and now I can't find it. Something wiped out the emails.|||A number of people are having this problem of entire blocks of e-mail vanishing Yahoo have no idea why. The number of people on here who lose important mail, photo's, document's et al is amazing. The first rule of computers is make a back up. The second is..another one. . Hard drives die, memory sticks die, mail goes missing, with 1 Tb drives at the price they are now it's not that expensive. Better safe than sorry.