I live in the Philippines. I can pretty much guarantee there is not a stash of gold/silver and its associated trust account. But, hey, why should I discount a perfectly good conspiracy theory? 1720 was a time of Spanish occupation in the Philippines. Not sure why Spain would keep that asset in the Philippines rather than in Spain.....
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"You're not a g*dda*n looney Martini, you're a fisherman"

R.P. McMurphy - One Flew Over The Cuckoo's Nest