I lost they keys and lied to my boss. Now my company is out tens of thousands of dollars.

I (25M) had been working overseas for a couple years for a company back home in the USA. I was in charge of a warehouse in a foreign nation that held tens of thousands of dollars of our equipment and merchandise. I was set to leave the country once my time there was done. I packed up and left back home. The day I arrived home I realized that the only keys to the warehouse were with me, when I should have left them at the country of my work. My boss called me all angry and troubled a few days later. They had sent a team to this country to continue the work I had been doing, but they had no access to this warehouse that has high security and wouldn’t open for anyone without a key. The team had to return. I told my boss that the key was left with the appropriate people. This lie lead to the team being sent back, only to find that the keys weren’t there. The owners of the warehouse found out and due to the contract my company had to pay thousands of dollars in fines. My boss has been hunting for a while to find out how this happened. Thankfully my story is airtight as I had given a set of keys to the right people, it just wasn’t the right set of keys, and these folks had lost these wrong keys. Anyways, I’m still on the payroll, and the keys to the warehouse (which to reopen and then do a late-transport of all the equipment and merchandise caused even more losses) are sitting comfortably in my underwear drawer. Not sure what to do with it.