This whole thing probably is just a hoax or just strange bid series of bids on EBAY, but nonetheless I am glad that the original poster reported it to the proper authorities.
I honestly think that leaving a paper trail and then successfully carrying out some form of terrorism is a way for terrorists to really thumb their noses at us even more. To me it would be bold way for them to almost "test" our intelligence agencies and even the general public. The events of 9/11 are proof that there is no limit to the evil that terrorists would attempt. They were successful due in part to the naive and almost callous attitude most of us had......that no one would ever dare attack US soil.
I know at the air cargo section of our airport there is a UPS terminal with UPS planes (not little ones, jumbo jet cargo planes) coming and going all day long. Not that I want to post ideas for terrorists here, but that's just one possibility. Plus think of all the places that get deliveries via UPS....hospitals, utilities, banks, government and civic buildings, shopping malls.....to name a few. A UPS guy in uniform usually doesn't get a second look in most places (unless there's security) if they've got their electronic clipboard and a card full of boxes. But still, the uniform could and probably WILL get them through the door....and in some cases that's all it could take for them to cause mass casualties.
Sorry to ramble.....just my view on this and any other activities that you might be seen as suspicious.
Thanks for keeping your eyes peeled for the rest of us looneyhouse.