Do you really think they would use such basic techniques if they really wanted to see some information?
Acoustic cryptanalysis, Van eck phreaking, your data would be gone in no time.
Although they would only do this stuff against people they really thought were plotting attacks and the like anyway.
Acoustic cryptanalysis only works with keys that makes a sound. Ever heard of a keyboard with beebing keys?
Van Eck phreaking only works on CRT monitors. Anyone still got one? Oh, it is possible to do it on LCD screens, but it's unlikely that the data reconstructed would be accurate.