The link metioned below provides a number to call:
Having Trouble Opening Your Safe? Do you need to replace a lost key? or do you need to recover your combination?Lost combo. Call us for combination for sentry safe.:(NNN) NNN-NNNNNew sentry safe keys or need a combination for sentry safe. WE can help our dedicated customer service team cares about you.Sentry safes are excellent when theft deterrence is a major concern, choose from Sentry security safes specially designed to protect valuables such as keepsakes, collectibles, heirlooms and jewelry. Concealment is a key way to protect your valuables.
I hope this answers your question. If not, then please reply. Thank you.