Ethics thought experiment poll:
You realize that by your mistake you forgot to pay for something you brought home from the store. A quick mental calculation puts the cost to the store of the lost item at less than the opportunity cost to you of taking the time to go back and return or pay for it; e.g., you can set things right, but only by wasting enough of your own time to more than make up for the value of the correction, objectively speaking. Do you go back?
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@earthshine If possible, I call first, explain the situation, and ask how they want it resolved.
@earthshine In light of your clarifications, I'd still try to make it right by them. So if calling first isn't an option, I'd make it my highest priority, go back, and eat all the personal costs of my mistake.