card reader

Alright, so I like to think of myself as a techy. I know my way around computers quite well, but this has got me stumped. My aunt's workplace started replacing some of their old tech, so she gave me a couple of the business grade laptops they were using - HP Elitebook 2540p. Pretty neat...

I have an Acer Aspire 5750G-6653. The card reader (which is located on the front left of the laptop) had something fall out of it, which I have since lost. I recall thinking that it must have just been a dust cover but now I'm realizing it was something more important. I tried to put an SD...