I think the ONLY problem I ever had with an order from Elderly was just a few weeks ago. I ordered a Blind Blake boxed set and received Flatt & Scruggs instead. Just a little bit of a difference. They corrected their error of course.
Many years ago when I worked for a record store Capricorn records rushed to get out the "Eat A Peach" double record set just after Duane Allman died. We got a whole bunch of them that had two of the same LP packaged together - and several that included an Aretha Franklin LP.