Fake name means no objection to opening the package, because you have no interests under the Fourth Amendment to assert, cause its not you, right? So you lose one layer of protection.
The employee at the UPS store is not a government employee like the USPS is. So if the officer says, "Hey, I can't instruct you to open it, wink, wink," and the UPS store employee opens it, you just lost another layer of constitutional protection.
Maybe read some case law about how these prosecutions actually work before throwing out advice. Just a suggestion.