I have a mini safe made by "sentry safe" and I lost my key. Is there anything I can do short of destroying it? Can I get my belongings back?

How mini is it? Can you get it to your local lock smith? They can find the numbers and make a key from scratch.

Or try this:
| Sentry® Safe | Need a Key (http://www.sentrysafe.com/CustomerCare/Need_A_Key)