I myself had this happen recently and the pack arrived several days later. Day it arrived in my box I noticed a ton of packages set out for neighbors. I used my real info and the box was not tampered with at all so I think there is a delay in general. Give it 5 days max and call about it. I called USPS about 5 times inquiring because that's what any normal person would do if they expected a pack and didn't receive it.
It looks suspicious if tracking shows delivered yet you don't call them up about it. Remain calm yall...
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