Treasure of unknown ownership found hidden (usually in the earth) WordNet 3.0 & Open English WordNet

A treasure trove is an amount of money or coin, gold, silver, plate, or bullion found hidden underground or in places such as cellars or attics, where the treasure seems old enough for it to be presumed that the true owner is dead and the heirs undiscoverable. Wikipedia

Hidden store of valuables. Wikipedia Disambiguation

A legal concept Wikipedia Disambiguation

Amount of money or coin, gold, silver, plate, or bullion found hidden Wikidata

Precious metal objects that were buried or concealed by an unknown owner. Wiktionary

A treasure trove; a collection of treasure. Wiktionary