You should feel a bit guilty, yes. You took advantage.
I saw somebody selling a statted level 40 cleric shield for 20 copper. I bought it straight away - nothing wrong with that, as if I hadn't, the next person to see would've. However, I wrote down the name of the seller and tried contacting them for a week. They were never online, so I've kept it. I tried to give it back - that's what you should've done.
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