UPS is in a very blind position right now. They lack the technology and control USPS has over what they ship. The only way they will ever stop anything is if it's been broken open, leaking, smoking, or someone has tipped them off.
If they were aware of something illegal going through their system, no UPS employee would have anything to do with it. They will allow it to pass through that sort shift, be loaded, and then secure the entire load and have that entire load searched by the appropriate authority.
Not from my experiences. I was a narc for a few years and worked closely with UPS and Fed Ex. The cases I worked were primarily Methamphetamine/Cocaine/Heroin/Marijuana. I never worked any aas cases. UPS and Fed Ex would routinely open packages to inspect them, as they do not need a search warrant to do so. Persons names and addresses were red flagged frequently by law enforcement request, or their own security divisions. If questionable items were found in the packages, then law enforcement would be notified. Also, the companies would allow a drug sniffing K-9 to check packages, primarily for recreational drugs, prior to being loaded into aircraft. And yes, UPS and Fed Ex will put whatever law enforcement asks them to put for the packages status.
I had done a great deal of controlled deliveries, such as Chemo first suggested in this thread. Some of where people were busted, others where the delivery was used to gather intelligence to build future cases.
I have also worked cases with U.S. Customs. One Agent I worked closely with told me they had oversea's targets where aas's were being mailed to U.S. citizens. He told me these packages were usually searched, and if it appeard only for personal use they would let it go through. They would then red flag that persons name/address for future deliveries. He also told me they would allow 3-4 deliveries before making some sort of contact. Contact would range from having local law enforcement making the inquirey, or the Agent himself making the contact. The Agent I worked with made it sound like it was not too big of a deal. He was also one of only two agents that worked a very large portion of California. So he did not have time to deal with the small stuff.
My suggestion is, if you ship anything questionable, place the items in a container less likely to be searched. Such as, if you are shipping pills, place them in a vitamin bottle and seal it. Most of the time, they will not bother opening an item if it is sealed. Same goes for any liquids/powders.
I didn't write this to get your level of paranoia up Candle.
Just play it cool for a while. At the most, your name/address may have been red flagged. You may want to try using another name and address when shipping next time. Just to be safe. I don't believe you have anything to worry about as far as a search warrant being conducted on your residence. If you are, the time element would be the following...the search warrant would have to be prepared and signed by a judge within 10 days of the alleged offense, then served within 10 days after the search warrant has been signed. So, after 20 days has past, you will need not worry about a search warrant being served on you.
Hope this helps.