Merlin, you're right, the blue one were bought at mouser, also some other that I have in stock looks similar to the one on the left side, I also noticed the precision and details put in themanufacture process, any opinions welcome, thanks.
They are both genuine. Check the shape of the bottom/rubber seal and the stamp pattern on the top. High value FCs (and FMs) exhibit a bit of green crystals forming around the leads close to the rubber even when new. It's a Panasonic feature
I got both sleeve colors and all were bought from Digikey on different periods.
A PCB stuffing company that I worked for some time ago got caught out by just such a problem. The customer had specified a particularly low ESR Panasonic capacitor for a job and these were ordered through our usual method of buying from the supplier with the lowest price quote.
A while after the finished boards were shipped we received the whole 500 of them back because the caps did not meet spec.
We ordered another batch from a different supplier and when they arrived, apart from a slight difference in colour, they looked identical.
When we checked the ESR the difference was immediately apparent.
The 'fakes' had a reasonably good reading but the 'genuine' were ten times lower.
The purchasing guy got his butt kicked even though he followed correct procedure.