I just got off a flight yesterday and was sitting in 1B. Just before landing, a FA came up the aisle with her rolling bag, proceeded to raid the liquor cart, and placed a bag with a bottle of wine and a few minis in her rolling bag. I even overheard her saying something to the other flight attendant like "there are still three left, are you getting one" referring I assume to the wine. Then she wheeled it back down the aisle (she was seated at the rear).

How rampant is this type of behavior? It's my first time witnessing it.

How should I report this and who should I report it to?