I collect mainly memorabilia and autographs. We have no classification system to use to search, so sometimes it can be even more random to find some rare items.
In my mind, there are really no tricks. There is time and effort.
As Rdwyer stated, using modifiers can help eliminate stuff from your search you don't want. This can cut down on the number of items you need to search, but, unfortunately, the more you narrow your search, the less hidden stuff you'll tend to find.
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