Some sellers purposefully list in the wrong category, either to avoid high fees in one category, to take advantage of free insertions, or just out of laziness.
But there are some items that can legitimately be classified into more than one category, such as a Consumer Electronics category and a Vintage Electronics category.
When searching for hard-to-find items, I often set up two very different searches: one that is very targeted, often just in a narrow category, that finds few if any results but avoids "false positives". This may be set up as an automated search to quickly alert me when such an item is listed.
The second search is much more wide open -- not limited to a specific category, using few if any filters in order to avoid "false negatives". The second search is run less often and requires more sifting through unwanted results, but the second search can find results that the first search does not, if, for instance, the seller lists in the wrong category.
