Interesting:
I've had many of the blackstone bottles go astray ... most recently I sent the sample from the Acura in the standard bottle out on July 7. It arrived in Indy on the 9th then "in transit to next facility" on the 13th (this is code for "it is lost" IME) wherein it disappeared until resurfacing in Ft Wayne on the 20th and being delivered.
But I sent one on the 13th as well, I happened to have a brake pad box that was very light and almost the perfect size, so I decided to peel the label and stick it on the box with he bottle inside. That one was delivered on the 16th ad never went AWOL.
I've gotten results on neither, and Blackstone hasn't called to yell at me for costing them extra postage....