*sigh* again... They were not breeding in my tank. I don't know if the guy's pond was slightly brackish or not, but they were reproducing in his ponds and I'm pretty sure I know what Amanos look like. After settling, they turned back into their typical color and their markings showed better.
Those ponds would have to be pretty salty, at least halfway to oceanic salinity, for Amanos to successfully complete their life cycle in them (probably 17 ppt upwards, which adults can
tolerate but is on the low end for good zoeal survival). That sounds unlikely unless he made an effort to intentionally maintain them that way.
It's kind of a moot point because that's hardly my only reason for saying they're not Amanos. Let's focus on the clearest shot, which luckily is of an ovigerous female:
(1) The rostrum is far too long to be that of an Amano, which would only make it a little bit past the orbital margin. This is an immediate giveaway and a reliable diagnostic character (given how invariable this is within this species). The limb diameter is more slender than is normal in Amanos.
(2) If I'm seeing this photo correctly, the size of the eggs is far larger and their number far fewer than that of actual Amanos (and their coloration is also atypical). This would indicate that these shrimp have at least partial abbreviation of larval development (which needn't make it mysterious that they didn't successfully breed in your tanks -- they could well be like the Caridina
sp. called "Malaya shrimp", where have a short planktonic period before the young settle down and become postlarvae. These planktonic stages don't require saline water, but are much more vulnerable to filter intakes and fish than would be young that immediately hatch out as benthic "miniature adults" ... pond survival would probably be better. And even fully-formed postlarvae aren't guaranteed to make it to adulthood in an aquarium setting.)
(3) I'm sure the patterning of your shrimp became more Amano-like (I'm guessing paler, with the dark dots a little more pronounced?) after a while, but what I see in the photos is frankly outside the range of natural variation for Amanos, under any conditions I can think of -- especially the cephalothorax, with its comparatively wide, continuous horizontal bands and absence of dark, discrete spots. Pigmentation of the the eyes is also much lighter than is typical of Amanos.
Now, this doesn't mean that the guy you got these from didn't purchase these as Amanos (and, as I've suggested above, they could well be breeding in his ponds even if they are freshwater). Mislabeling happens, and non-target species get into collectors' buckets or exporters' tanks. If you really couldn't distinguish these from what you bought as Amanos from another source, then possibly those were mis-ID'd too (but more than a few small atyids look "close enough" to similarly-sized Amanos at first glance).