Fortunately bought items only occasionally suffer from this problem (in direct proportion to the quality of testing / QA at the store concerned).
Freebies are much more likely to be afflicted.

The easiest way to avoid running into it is to get into the habit of unpacking to a temporary directory and doing a text search on the files for "" (check for absolute paths) and ".bum" check for files referring to BUM files (can be edited to refer to the JPG file if it's supplied).