There were two items found at the site that I forgot to mention in the thank you e-mail I sent. One is a black plastic storage case for an electric air pump.
The other is a plastic part from the front lower area of a BMW…
http://realoem.com/bmw/showparts.do?model=BU33&mospid=49304&btnr=17_0145&hg=17&fg=05&hl=93
#5 in the diagram was found on the figure-8 exercise. I have it stored in the trailer, so if it’s yours and you want it back, get in touch.
Based on the part number it belongs to one of the following vehicles:
Part 17111436245 (SEALING LOWER) was found on the following vehicles:
E46: Details on E46
E46 320i Sedan
E46 323Ci Convertible
E46 323Ci Coupe
E46 323i Sedan
E46 323i Touring
E46 325Ci Coupe
E46 325Ci Convertible
E46 325i Touring
E46 325i Sedan
E46 325xi Sedan
E46 325xi Touring
E46 328Ci Coupe
E46 328i Sedan
E46 330Ci Convertible
E46 330Ci Coupe
E46 330i Sedan
E46 330xi Sedan
E85: Details on E85
E85 Z4 2.5i Roadster
E85 Z4 3.0i Roadster
E85 Z4 3.0si Roadster
E86: Details on E86
E86 Z4 3.0si Coupe