Am I a thief?

[Moonliner]

Am I a thief, immoral or just a savvy consumer?

I went into Subway for lunch today. I ordered a 6" Subway melt with double meat (very yummy). When I made it to the cashier she only charged me for a single meat sandwich. Had she asked me what I ordered I would have said "double meat". She never asked so I just paid the requested amount.

I did notice the error and could have spoken up but chose not to. If she had overcharged me I certainly would have not let it slide.

So am I thief? I ordered a product and paid the amount requested by the store.

Am I immoral? I did not go in with the intention to defraud.

Or just a savvy consumer?