OK…
you get off a flight at the airport
you pick up your suitcase from baggage claim
you drive home
you open your suitcase
it’s not your suitcase
it’s $250,000 in cash
What do you do? 
Discussion
Take random serial numbered bills from random places and use it to buy a safe with at least a 4 turn combination lock. Check here: https://www.omegasafeandlock.com/high-security-safes
Any unique characteristics? Or just a big ol' fungible bag of (kinda) fungible cash?
My gut says return it; your mug is all over airport surveillance, fed into AI for the future,
And also it's not yours, you didn't earn any of it
* Return it to it's owner if possible, not naively back to the airport that fucked up in the first place
Convert it to BTC asap 🤔🤣