What happens if I put a UPS package in a USPS box?

Well I accidently placed a UPS package in a USPS box accidently. I called them right after to tell them of the situation and they said they would take care of it. It's been a week already and the receiver hasnt confirmed the package has been received. From Chicago, IL to LAREDO, Texas. If it was to return to... show more Well I accidently placed a UPS package in a USPS box accidently. I called them right after to tell them of the situation and they said they would take care of it. It's been a week already and the receiver hasnt confirmed the package has been received. From Chicago, IL to LAREDO, Texas. If it was to return to sender, I still haven't gotten it yet. Does it takes this long?
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