Honestly, since I am new to Metal Detecting, I don't know if this is considered a cache but I dropped by a City park playground and I found 8 quarters all in one spot, all new and clean. In addition, I found 1 dime and 4 pennies.
If they are from the relatively same hole its a pocket spill.
Cache would be something buried on purpose. Usually in a container of sorts. Congrats tho!