@HikingMano
A lot of those teeth are indeed very small, some of them are smaller than 1mm.
To find these, you take the material home, wash it on different screens with different widths (5mm-3mm-1mm-0.5mm), let it dry and then you have several storage boxes that look like this:
Then, you search through those kilos and kilos of material using this:
Not to mention, it takes a looooooong time before you've searched through everything. The problem is, that stuff keeps piling up in my working area

.
Here are a few quick (and crappy) pictures of some of my drawers with shark teeth. (Yep,
some)
The top of that cabinet, showing some Megalodon teeth and some matrix pieces with shark teeth, as well as two recent jaws, a Mammoth tooth, a tooth of a Whooly rhino and some other stuff
BUT, back on topic now 'cause this isn't really outdoors anymore ;-)