Would it be called "good karma" if a shop forgot to charge you $ 150 for items after you had left their store?

if they had taken your card information, and you signed and everything, but they forgot to run your card, or lost the ticket or something and for some reason you were never charged. would you count it as "good luck" or "good karma" and forget about it and feel lucky or would you feel guilty and... show more if they had taken your card information, and you signed and everything, but they forgot to run your card, or lost the ticket or something and for some reason you were never charged. would you count it as "good luck" or "good karma" and forget about it and feel lucky or would you feel guilty and call the shop and give card number again over phone? what if they asked if you could come in again and sign for it? why? be honest please ..
Update: how depends on your income level and how "well off" you figure the owner of the shop is? can explain?
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