Is this illegal? Read please

Today I looked to see if I package I ordered said delivered and it did so I went out to our mailbox (my town is weird, each street has all their mailboxes in one spot instead of right outside our houses) and it wasn’t in my mailbox. So I checked the mailbox right next to mine and sure enough there was my package. I’m not sure if that’s illegal to get my own package out of someone’s mailbox? I mean honestly I wouldn’t have done it if it was something cheap but it was expensive custom jewelry and I know that if something gets delivered to you that isn’t yours you have a right to keep it. So idk.

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