It appears that since the 2015-05-31 redesign, captures are without the customary banner.
Before: http://web.archive.org/web/20150214164525/https://forums.macrumors.com/
After: http://web.archive.org/web/20150608015616/https://forums.macrumors.com/
Unless I'm missing something, http://archive.org/about/faqs.php#The_Wayback_Machine offers no explanation for nonappearance of the banner. Someone at MacRumors might like to contact the Internet Archive.
Before: http://web.archive.org/web/20150214164525/https://forums.macrumors.com/
After: http://web.archive.org/web/20150608015616/https://forums.macrumors.com/
Unless I'm missing something, http://archive.org/about/faqs.php#The_Wayback_Machine offers no explanation for nonappearance of the banner. Someone at MacRumors might like to contact the Internet Archive.