Just guessing here since no details are given but normally (excluding special equipment used by govt/banks/etc) the type of lock used on computer cases is low security, it's only really meant to prevent opportunistic theft. The keys are easy to get. It could also be talking about a laptop, which can be opened with a screwdriver. To me the description sounds like a disgruntled employee or an employee who was bribed by a competitor. A serious espionage attempt would be more sophisticated, for example using a special tiny USB key which doesn't even look like a USB key, and only needs to be plugged in and can automatically image all the drives onto itself.