Yes it's the same at my work, the hard drives are pulled on redundant computers before they are scrapped to protect company data. It's pretty pointless to be honest as all company data is stored on the central server drives as a rule, meaning the only things on individual computers are the OS, apps and any personal files put on the drives by employees. Occasionally the odd machine gets thrown out with the drive still inside so I'm always keeping an eye out for them as spare hard drives are very handy.