I think you're not understanding how shipping and mail service works, at all. The person who sent the package to you via USPS determines HOW it gets sent to you. It sounds like they sent it non-priority ground. Or possibly even book rate, which is slower. What happens is - the company sends the post office a request for a shipping label. This happens electronically. The label is printed at the company, and the post office now has notification that there's a pickup needed. Some time within the next 24 hours, the post office goes to the company *specifically* to pick up packages (this isn't drop-off, it's pickup). You would have received notification that shipping label was printed, the day before.
Then, the post office truck brings the package to his station. Then, his station sends it to the local regional distribution center. Then, the distribution center sends it to the distribution center that includes your state's distribution region in it. Then, that distribution center sends it to the distribution that is assigned to the area where your zip code is located. Then, that distribution center sends it to the post office assigned to your zip code. Then, that post office sorts the mail and sets your package into the bin that gets loaded onto your driver's truck. Then your driver delivers it.
This is how it works, whether it's the company two counties away, two states away, or the guy next door sending you a Christmas card in the mail. If it's book rate or non-priority ground, that is the process. And yes it can take several days.
"First Class Mail" is a very specific designation, which bypasses some of the above. But it would still take a couple of days, and it would cost extra since it's a package, not a letter.
If you wanted it sooner you might have been able to request that the company send it to you priority or 2nd day, but you would've had to pay extra for that.
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