Thank you Allan, Rick, Marc & Rolf, I appreciate your comments.
I combined the 3 x 10 min Lum data from the 17th May with the 20 x 5 min Lum data from 18th May and this has added some density to the clump of grains where AM-4 is shown in the image from Las Campanas Observatory. A new animation is attached.
I am now more confident now that the data from Brisbane is “real” and not just a collection of coincidentally matching, background noise!
Cheers
Dennis