I've got to agree 100% with lwrs10 on this regarding the prominence of fake caps (and many other parts out there) coming out of China.
He is also correct that Elna caps will have the series name printed on them.
Rob - the top two photos you're using to represent "real" Elna caps are from Web shops in China. Compare the caps against Elna's own spec sheets.
In many cases, fake caps do indeed weigh less than their real counterparts, due to cheaper and/or less internal materials used. Not related to the T1, but some large faked electrolytic caps actually have cheap smaller caps soldered inside of the cans that are then imprinted with fake labels.
There's a Web forum dedicated to helping identify and root some of them them out. badcaps.net
I've gotten to the point over the years after seeing so much of it that I just about assume any inexpensive audio product coming out of China is using fake parts. Caps, resistors, Alps pots, tubes, resistors, op amps, transistors... the list goes on. DIY forums have posts all the time about people finding fake parts. I no longer trust any electronic parts on eBay with prices that seem to be bargains whether or not they come out of China, because it's also easy to buy them in bulk and re-sell. There's plenty of info out there to read about this, it's neither rare nor a false accusation. In some cases, it can even be dangerous, when parts specified for high voltages or current are faked without appropriate QC/testing.