Lock pick set and a nice practice lock from Sparrows.
Started with the tuxedo set, and added some additional TOK tension wrenches, and some additional thin .015 picks and rakes.
The practice lock uses schlage keys, and is re-pinnable. I got the re-pinning kit which comes with pins and 4 different keys, along with spool pins and serrated pins.
After playing with several setups in the practice lock, I was able to pick one of the cheap Master gun cable locks. It's got a really tight keyway, which made it more challenging than a master lock should be.
Then my daughter in law brough over their stack-on "gun safe" lockbox. They said the batteries had died, and couldn't find the backup key, maybe they were inside the safe. This was my first wafer lock, and picking it took a couple hours for me to learn how wafer locks work, and dealing with picking both sides of the double sided key.
As you can see in the picture, the cheap plastic door on the battery compartment had fallen off, allowing the batteries to fall out, rendering the electronic lock useless.
And none of the keys inside were the keys to the safe, so they'll continue to try to find them.