There is no current issue 2000 Peso note, so it must pre-date revaluation in 1992 making it's face value about $0.15. The last issue of this denomination was 1985-89, with a mint uncirculated example worth $2-$3. Older notes are generally worth more, but you would have to supply the date and condition for a more accurate estimate of value.
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A very good used example would be worth $3.50, rising to $12.50 in mint uncirculated condition.