Locking Gas Cap?

[DMillerJD]

Hi All, I have a 2007 232, which gets stored on an unsecured lot (although it’s generally in a safe neighborhood). I was heading out to put my boat in the water for the first time this season, and filled it with 47 gallons (50 gal tank). Don’t recall letting it get that low, so started thinking maybe someone siphoned off some gas. Does anyone know if there is a locking gas cap for the Cobalt fuel fill? Thanks in advance!

[Big Block Power]

Maybe this?
https://www.boatid.com/sea-dog/1-1-2-ho ... S0QAvD_BwE